Which one of the following considered to be ancestor of all other?

Options

A. Cabbage
B. Cauliflower
C. Kohlrabi
D. Colewort

Explanation

To determine which plant is considered the ancestor of all the others listed (cabbage, cauliflower, kohlrabi, and kohlwort), we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Plants**: The options given are cabbage, cauliflower, kohlrabi, and kohlwort. We need to understand the relationship between these plants.

2. **Understand Kohlwort**: Kohlwort is identified as a wild mustard plant. It serves as the base from which other varieties have been developed through selective breeding.

3. **Selective Breeding**: Selective breeding is a process where specific traits are chosen to produce desired characteristics in plants. This can occur naturally or through human intervention (artificial selection).

4. **Deriving Other Plants from Kohlwort**:
- **Cabbage**: Derived from selecting the terminal buds of kohlwort.
- **Cauliflower**: Developed by selecting the flower clusters of kohlwort.
- **Kohlrabi**: Created by selecting the stem of kohlwort.
- **Brussels Sprouts**: Formed by selecting the lateral buds of kohlwort.
- **Kale**: Developed by selecting the leaves of kohlwort.
- **Broccoli**: Produced by selecting the stems and flowers of kohlwort.

5. **Conclusion**: Since all the other plants (cabbage, cauliflower, kohlrabi, and others) are derived from kohlwort, it is considered the ancestor of all these plants.

### Final Answer:
The correct option is **kohlwort** (option D), as it is the ancestor of all the other plants listed.

---