Which of the following show restricted distribution?

Options

A. Elephants
B. Pouched mammals
C. Alligators
D. Lung fishes

Answer

To solve the question of which of the following shows restricted distribution, we will analyze each option provided.

### Step-by-Step Solution:

1. **Understand the Concept of Restricted Distribution**:
- Restricted distribution refers to organisms that are found only in specific geographic areas and cannot survive outside of those areas due to habitat or climate changes.

2. **Evaluate Each Option**:
- **Option A: Elephants**
- Elephants are found in various regions, including Africa and South Asia. Since they inhabit multiple areas, they do not show restricted distribution.
- **Option B: Pouched Mammals**
- Pouched mammals, such as kangaroos and koalas, are primarily found in Australia. They are not found in other countries, indicating that they have a restricted distribution.
- **Option C: Alligators**
- Alligators can be found in various locations, including America and Canada. Their presence in multiple regions means they do not have restricted distribution.
- **Option D: Lungfishes**
- Lungfishes are distributed across different continents, including America, Australia, and Africa. Therefore, they also do not exhibit restricted distribution.

3. **Conclusion**:
- After evaluating all options, the only group that shows restricted distribution is **pouched mammals** (Option B), as they are exclusively found in Australia.

### Final Answer:
- **The correct answer is B: Pouched Mammals.**