Three of the following four are alike in a certain way and so form a group. Which is the one that does not belong to that group ?

Options

A. Carrot
B. Radish
C. Potato
D. Sweet Potato

Answer

To solve the problem, we need to analyze the four options provided: carrot, radish, potato, and sweet potato. We will classify them based on their botanical characteristics.

### Step-by-Step Solution:

1. **Identify the Options**:
- Option 1: Carrot
- Option 2: Radish
- Option 3: Potato
- Option 4: Sweet Potato

2. **Classify Each Option**:
- **Carrot**: This is a modified root (specifically, a taproot).
- **Radish**: This is also a modified root (a fleshy root).
- **Potato**: This is a modified stem (specifically, a tuber).
- **Sweet Potato**: This is a modified root (a storage root).

3. **Group the Similar Items**:
- From the classifications:
- Carrot (modified root)
- Radish (modified root)
- Sweet Potato (modified root)
- Potato (modified stem)
- The first three (carrot, radish, sweet potato) are all modified roots.

4. **Identify the Odd One Out**:
- Since carrot, radish, and sweet potato are all modified roots, and potato is a modified stem, the odd one out is **Potato**.

5. **Conclusion**:
- The option that does not belong to the group is **Option 3: Potato**.

### Final Answer:
**Option 3: Potato**