One of the following occurs in the reproductive system of flowering plants as well as that of humans. This is :

Options

A. vas deferens
B. anther
C. ovary
D. style

Answer

To answer the question "One of the following occurs in the reproductive system of flowering plants as well as that of humans," we need to analyze the options provided and identify the common element in both systems.

### Step-by-Step Solution:

1. **Identify the Options**: The question presents several options related to the reproductive systems of flowering plants and humans. We need to consider each option carefully.

2. **Analyze Vasa Difference**: The Vasa difference (or vas deferens) is a part of the male reproductive system in humans that helps in the transfer of sperm. However, this structure is not present in flowering plants. Therefore, it cannot be the correct answer.

3. **Examine Anthar**: Anthar refers to the male reproductive part found in flowers (anther). This structure is specific to plants and does not exist in humans. Thus, this option is also not correct.

4. **Consider Ovary**: The ovary is a crucial part of the female reproductive system in both humans and flowering plants. In humans, it produces eggs (ova), while in flowering plants, the ovary contains ovules and is part of the female reproductive structure (pistil). This makes ovary a common element in both systems.

5. **Look at Style**: The style is a part of the female reproductive system in flowering plants, connecting the stigma to the ovary. However, it does not have a counterpart in the human reproductive system, making it an incorrect option.

6. **Conclusion**: After analyzing all the options, the only structure that is common to both the reproductive systems of flowering plants and humans is the ovary.

### Final Answer:
The correct answer is **ovary**.