Under the Smart Location and Linkage Credit for Preferred Locations, maximum points are awarded to sites that are both infill and previously developed. This is because such sites typically have better access to existing infrastructure and services, reducing the environmental impact of development. Infill sites help limit urban sprawl, while previously developed sites contribute to the reuse and revitalization of land. Option B meets both criteria, hence earning the maximum points for this credit.
References:
* LEED v4 Neighborhood Development Guide: The guide discusses the criteria for Preferred Locations and the importance of infill and previously developed sites (USGBC, LEED v4 Neighborhood Development Current Version).
* LEED Reference Guide for Neighborhood Development: This guide explains the scoring system for the Preferred Locations credit and the benefits of using infill, previously developed sites (USGBC, LEED Reference Guide for Neighborhood Development).