Geocarpic fruit is

Options

A. Potato
B. Peanut
C. Onion
D. Garlic

Answer

### Step-by-Step Solution:

1. **Understanding Geocarpic Fruits**:
- Geocarpic fruits are a type of fruit that develop underground. The term "geocarpic" comes from "geo" meaning earth and "carp" meaning fruit. This indicates that the fruit forms and ripens below the soil surface.

2. **Identifying the Process of Geocarpy**:
- In geocarpy, the plant produces diaspores (the dispersal unit of the plant) that develop underground. This is a rare method of reproduction among plants.

3. **Analyzing the Given Options**:
- The options provided are potato, peanut, onion, and garlic. We need to determine which of these fruits is geocarpic.

4. **Examining Each Option**:
- **Potato**: This is a tuber and does not develop as a fruit underground.
- **Peanut**: This is known to be a geocarpic fruit. After fertilization, the flower stalk bends and pushes the ovary into the soil where it develops and ripens.
- **Onion**: This is a bulb and does not produce fruits underground.
- **Garlic**: Similar to onion, garlic is also a bulb and does not develop as a fruit underground.

5. **Conclusion**:
- The only option that fits the definition of a geocarpic fruit is the peanut. Therefore, the answer is **peanut**.