Correct answer: C). Agronomy
Agronomy is the branch of agriculture science that study aims to study the crops and the soil in which the crop is grown. Agronomist is the people who study that in order to improve the production of fiber crops and food and improve the use of soil.
It involves the application of subjects like biology, economics, chemistry, ecology, water science, pest management, genetics to improve the management of food crops grown all over the world.