Earthworm have

Options

A. Well-developed special sense organs
B. eyes and ears
C. receptor cells only
D. complex sense organs.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about the sensory organs present in earthworms.

2. **Identifying the Options**: The options provided are:
- Well-developed special sense organs
- Eyes and ears
- Receptor sense only
- Complex sense organs

3. **Analyzing Earthworm Anatomy**: Earthworms are known to lack complex sense organs like eyes and ears. They do not have well-developed special sense organs.

4. **Identifying Sensory Structures**: Instead of complex organs, earthworms possess receptor cells. These receptor cells are responsible for sensing touch, taste, and light.

5. **Conclusion**: Since earthworms do not have eyes, ears, or complex sense organs, the correct answer is that they have "receptor cells only."

6. **Final Answer**: The correct answer is option number 3: "Receptor cells only."

---