Concept: Agronomy deals with crop production and soil management to improve yields sustainably.Explanation:Agronomy focuses on crop growth, soil fertility, water use, and pest and disease control.Managing soil fertility and controlling pests and diseases are direct agronomic practices.Maximizing crop yield is the main aim of agronomy.Promoting biodiversity conservation is more related to ecology and environmental management, not a core principle of agronomy.Answer: C. Promoting biodiversity conservation