Fruits are seen in only a few Papaya plants while the flowers are present in all. This is because:

Options

A. It is a dioecious plant.
B. Fruit is formed by female Papaya plant. (
C. Female reproductive parts are present only in some Papaya plants.
D. All of these.

Explanation

To solve the question regarding why fruits are seen in only a few papaya plants while flowers are present in all, we can analyze the options provided step by step:

### Step-by-Step Solution:

1. **Understanding the Plant Type**:
- The papaya plant is classified as a dioecious plant. This means that male and female reproductive organs are found on separate individuals. Therefore, not all papaya plants can produce fruits.

**Hint**: Recall the definition of dioecious plants and how they differ from monoecious plants.

2. **Identifying Reproductive Roles**:
- In dioecious plants like papaya, only the female plants have the ability to produce fruits. Male plants produce pollen but do not bear fruits.

**Hint**: Think about the roles of male and female plants in reproduction and fruit development.

3. **Evaluating the Options**:
- **Option A**: "Because it is a dioecious plant" - This is true since it explains the separation of male and female plants.
- **Option B**: "Because fruit is formed by female papaya" - This is also true as only female plants can produce fruits.
- **Option C**: "That female reproductive part is present only in few papaya plants" - This is correct because only female plants bear fruits, and not all papaya plants are female.
- **Option D**: "All of these" - Since all the previous statements are true, this option is also correct.

4. **Conclusion**:
- Since all the options are valid statements regarding the reproductive nature of papaya plants, the correct answer is **Option D: All of these**.

### Final Answer:
The correct answer is **D: All of these**.