The correct answer is D, provide qualifying electrical vehicle supply equipment in 2% of all parking spaces. According to the LEED v4 Reference Guide for Building Design and Construction, the Location and Transportation Credit, Green Vehicles, requires that projects provide preferred parking for green vehicles for 5% of the total vehicle parking capacity of the site. Green vehicles are defined as vehicles that achieve a minimum green score of 40 on the American Council for an Energy Efficient Economy (ACEEE) annual vehicle rating guide1 In addition, projects must provide one of the following:
Install alternative-fuel fueling stations for 3% of the total vehicle parking capacity of the site. Alternative fuels are defined by the U.S. Energy Policy Act of 1992 and include biodiesel, electricity, ethanol, hydrogen, natural gas, and propane.
Install electrical vehicle supply equipment (EVSE) for 2% of the total vehicle parking capacity of the site. EVSE must be Level 2 or higher as defined by SAE International's J1772 standard.
Provide a discounted parking rate of at least 20% for green vehicles. The discounted rate must be available to all customers (not limited by time of day or user groups), publicly posted at the entrance of the parking area, and included in all marketing materials for the parking facility1 In this case, the project team has provided preferred parking for green vehicles for 20% of the total vehicle parking capacity of the site (4 out of 20 spaces), which exceeds the minimum requirement of 5%. However, they still need to provide one of the additional options listed above to achieve the credit. The most feasible option for a school project with a small parking lot would be to install EVSE for 2% of all parking spaces, which would be equivalent to one space. Therefore, answer D is correct.
The other answers are incorrect because they do not meet the credit requirements. Answer A is incorrect because providing preferred parking alone is not sufficient to achieve the credit; one of the additional options must also be provided. Answer B is incorrect because providing bike racks is not relevant to this credit, which focuses on green vehicles; bike racks are part of another credit, Location and Transportation Credit, Bicycle Facilities. Answer C is incorrect because providing an additional parking space for a low-emitting and fuel-efficient vehicle would not increase the percentage of preferred parking above 20%, which is already more than enough; moreover, low-emitting and fuel-efficient vehicles are defined differently from green vehicles in LEED v4 and have their own credit, Location and Transportation Credit, Reduced Parking Footprint1 Reference: 1: LEED v4 Reference Guide for Building Design and Construction, Location and Transportation Credit: Green Vehicles, page 467.

Natural daylighting can reduce the electricity use for artificial lighting, which is one of the major components of operational energy cost for buildings. By having the lights off or dimmed when sufficient daylight is available, the project can save energy and money. The other options are not necessarily true or relevant for natural daylighting. Heat gain and passive solar heating depend on the orientation, shading, and insulation of the windows, not just the amount of daylight. Reduction in lighting fixture use may reduce re-lamping, but that is not a significant factor in operational energy cost compared to electricity use. References: EA Credit Optimize Energy Performance, EQ Credit Daylight, LEED v4 Reference Guide for Building Design and Construction123

The renewable energy option is economically feasible if the present value of the utility cost savings over the lifetime of the system is greater than or equal to the present value of the higher initial cost of the system. This means that the system will pay for itself and generate net savings in the long run. The utility cost savings depend on the amount of energy produced by the solar thermal panel, the price of natural gas, and the inflation rate. The higher initial cost depends on the size, type, and installation of the solar thermal panel.

According to the LEED v4: Building Design + Construction Guide, Option 2 of the Location and Transportation Credit, Green Vehicles requires the project to inventory the school fleet to develop and create a plan for all buses to meet the emission requirements. The plan must include a timeline for implementation and a budget. The emission requirements are based on the U.S. Environmental Protection Agency (EPA) standards for heavy-duty vehicles1. References: LEED v4: Building Design + Construction Guide, Location and Transportation Credit, Green Vehicles, Option 2: Green Buses or School-Owned Vehicles1

This option requires the project to increase the breathing zone outdoor airflow by at least 20% above the minimum rates required by ASHRAE 62.1-2010. Therefore, the minimum design zone outdoor airflow is
0.120 CFM/ft2 x 1.2 = 0.144 CFM/ft2.
References: = [LEED v4: Building Design + Construction Guide], [Indoor Environmental Quality Credit:
Enhanced Indoor Air Quality Strategies], [ASHRAE 62.1-2010 User's Manual].