An economic advantage of the infill site is that it reduces the need for new utility infrastructure. This is because the infill site is located within an existing urban area that already has access to water, sewer, electricity, and other utilities1. The developer can save on the costs of extending or installing new utility lines and services to the rural greenfield site, which may not have adequate or reliable utility infrastructure2. The other options are not economic advantages, but rather environmental benefits of the infill site. Protecting greenfields and farmland, preserving habitat and natural resources, and reducing potential damage to an existing stream are all positive outcomes of avoiding development on the rural greenfield site, but they do not directly translate into monetary savings for the developer3.
References:
*High-priority site, p. 1
*The Economics of Infill Development, p. 2
*LEED v4 for Building Design and Construction, p. 69

Detailed Explanation:
ISO 14040/44 LCA information is not a substitute for an EPD in LEED documentation. To meet the requirements of the Building Product Disclosure and Optimization credit, an EPD must comply with specific LEED-recognized standards. If the manufacturer cannot provide an EPD, the project team should consider sourcing a comparable product from another manufacturer that has an EPD to maintain compliance.

Explanation
The Integrative Process Credit is a credit in LEED Building Design and Construction that supports high-performance, cost-effective project outcomes through an early analysis of the interrelationships among systems1. The credit requires project teams to perform analyses for both energy- and water-related systems before completing the schematic design, and to use the findings to inform the owner's project requirements, basis of design, and design and construction documents1. The example given in the question is an illustration of how selecting a paint color with a higher light reflectance value can reduce the energy use and cost of lighting fixtures, which is an energy-related system. This strategy shows how the project team applied an integrative process to evaluate the impacts of different design options on the building performance and environmental benefits. Therefore, the correct answer is B. Integrative Process Credit.
References:
Integrative Process

The make and model of fixtures is required in determining the baseline for the Water Efficiency Prerequisite, Indoor Water Use Reduction. This information is used to calculate the baseline water consumption of the building, which is then compared to the proposed water use to determine the percentage reduction.
Reference: LEED AP Building Design + Construction (LEED AP BD+C) V4 resources 1

Under LEED BD+C Energy and Atmosphere (EA) Credit: Renewable Energy Production, renewable biofuels must be sustainably sourced and not contaminated.
* Non-mill residue forestry biomass waste qualifies as renewable biofuel because it consists of untreated wood residues from sustainable forestry operations.
* Municipal solid waste is not considered renewable due to its mixed content.
* Wood coated with paints, plastics, or resins is not renewable as it contains harmful chemicals.
* Animal waste is not explicitly recognized by LEED as a renewable fuel.
(Source: Official LEED BD+C Reference Manual)