The correct answer is option (D):
Agronomy
The correct answer is Agronomy. Agronomy is the science and technology of producing and using plants for food, fuel, fiber, and land restoration. This encompasses soil management, crop production, and a wide range of related practices. Geology is the study of the Earth, philology is the study of language and literary texts, kinesics is the study of body language, and gemology is the study of gemstones. None of these options directly address the science of soil management and crop production, making Agronomy the only suitable choice.