Concept:Agronomy is the branch of agricultural science that focuses on the practical management of soil and crops to improve farm productivity.
Explanation:Agronomy combines knowledge of soils, crops, and environmental practices to ensure sustainable farming.
Its main activities include selecting suitable crops, preparing the soil, planting, fertilizing, irrigation, and controlling weeds and pests.
These activities are all part of soil and crop management.
Breeding and genetics of crops is mainly plant breeding, while climate study is meteorology and product selling is agricultural marketing.
Therefore, the central focus of agronomy is managing both the soil and the crops grown in it.
Answer:A. Management of soil and crops