Explanation
Pre-consumer recycled content refers to waste material that is diverted from the waste stream during the manufacturing process. This can include scraps or trimmings that are collected and returned to the manufacturing process. It does not include rework, regrind, or scrap materials capable of being reclaimed within the same process that generated them. References: LEED Green Associate Candidate Handbook, U.S.
Green Building Council resources

Installing operable windows is the best answer because it gives occupants some control over ventilation and comfort conditions. Thermal comfort is influenced by air temperature, radiant temperature, humidity, air movement, clothing, and activity level. Because occupants have different preferences, LEED Indoor Environmental Quality supports strategies that improve comfort and, where possible, provide individual or group controls. Operable windows can help occupants adjust air movement and fresh air when outdoor conditions are appropriate. Task lighting improves visual comfort and may slightly reduce overhead lighting loads, but it is not primarily a thermal comfort strategy. A building- wide strategy based only on average benchmarks may leave many occupants dissatisfied. Removing occupant control is incorrect because control is often associated with improved comfort, satisfaction, and productivity.

Explanation
Open grid pavement, also known as permeable pavement, allows water to drain through it, reducing runoff and recharging groundwater supplies. It also tends to be lighter in color than traditional asphalt, which means it absorbs less heat from sunlight. This helps to reduce the urban heat island effect, which is a phenomenon where urban areas are significantly warmer than their rural surroundings due to human activities. References:
LEED Green Associate Candidate Handbook, U.S. Green Building Council resources

A scorecard rule for LEED Credit Point Allocation is that there is a maximum of 100 base points available for each rating system. These points are distributed among the different credit categories based on their relative contribution to the overall environmental impact and human health benefits of a project. The point allocation process is informed by a weighting methodology that uses life cycle assessment and expert judgment to assign weights to each of the LEED impact categories. The impact categories reflect the goals and priorities of LEED, such as reversing climate change, enhancing human health, protecting water resources, and promoting social equity. References: LEED v4 Impact Category and Point Allocation Process Overview1; LEED scorecard5

Placing grilles, grates or mats at all major entrances is an example of permanent entryway systems used to reduce dust, dirt and contaminants brought into a facility. Permanent entryway systems are designed to capture dirt and particulates from people's shoes and prevent them from entering the indoor environment. This improves the indoor air quality and reduces the need for cleaning and maintenance. The LEED Green Associate Candidate Handbook states that one of the strategies for achieving indoor environmental quality is to "use permanent entryway systems (grilles, grates, mats) to reduce particulate matter being brought into buildings at regular entryways" [1, p. 16]. Reference: LEED Green Associate Candidate Handbook, [Indoor Environmental Quality | U.S. Green Building Council]