A commercial office building project is pursuing LEED certification.

Indoor Environmental Quality is the best answer because it directly supports occupant health, comfort, and well-being through better indoor air quality, thermal comfort, daylight, views, lighting quality, acoustics, and control of contaminants. The question emphasizes enhancing occupant well-being, which is a primary purpose of the EQ category. Energy and Atmosphere reduces energy use and emissions, Water Efficiency reduces water demand, and Materials and Resources promotes responsible material life cycles. These categories can indirectly support ecosystems and human health, but they are not as directly focused on healthy indoor environments for building occupants. Since the question asks which category would support healthy people most directly, Indoor Environmental Quality is the strongest LEED Green Associate answer.