Agronomy is the study of

Options

A. rearing and management of domesticated animals
B. developing new techniques for improving agricultural practices
C. cultivation of fruits, vegetables and ornamental plants
D. study of seeds.

Explanation

**Step-by-Step Solution:**

1. **Understanding Agronomy**: Agronomy is a branch of science that focuses on agricultural practices. It encompasses the study of how crops are produced and managed on agricultural land.

2. **Differentiating Agronomy from Other Fields**: It is important to distinguish agronomy from related fields. For instance:
- Animal husbandry deals with the rearing and management of domesticated animals, which is not the focus of agronomy.
- The cultivation of fruits, vegetables, and ornamental plants is generally referred to as agriculture, which is broader than agronomy.

3. **Identifying the Correct Focus of Agronomy**: Agronomy primarily involves the development of new techniques and methods to improve agricultural practices. This includes cultivation, planting, and harvesting processes.

4. **Evaluating the Options**:
- The first option relates to animal husbandry, which is incorrect.
- The second option mentions developing new techniques for improving agricultural practices, which aligns with the definition of agronomy.
- The third option refers to the cultivation of specific plants, which is not specific to agronomy.
- The fourth option discusses the study of seeds, which is a different area of study.

5. **Conclusion**: Based on the evaluation of the options, the correct answer is the second option: "developing new techniques for improving agricultural practice."