Ian McHarg’s overlay planning technique, introduced in his 1969 bookDesign with Nature, uses map overlays to identify areas suitable for development by assessing environmental constraints (e.g., floodplains, slopes). The goal is to guide development to areas where it will be least environmentally damaging (option A). The APA’sAICP Certification Exam Content Outline(2022), under “Fundamental Planning Knowledge,” states, “McHarg’s overlay planning technique identifies areas for development that minimize environmental damage by analyzing natural constraints.” Option B (least economically viable) contradicts the purpose of guidingfeasible development. Options C (most physically feasible) and D (most spatially efficient) are secondary considerations, as McHarg prioritized environmental impact. TheCPC Study Manual(2024) confirms, “McHarg’s method uses overlays to locate development where it is least environmentally damaging,” supporting option A.