Which of the given containers will continue to have healthy fish and plants at the end of a week?

Options

A.
B.
C.
D. None of these

Explanation

To determine which container will continue to have healthy fish and plants at the end of a week, we need to analyze the conditions in each option provided.

### Step-by-Step Solution:

1. **Understanding the Importance of Water Clarity**:
- Healthy fish and plants require clean, clear water. This allows for proper light penetration for photosynthesis and adequate gas exchange.

2. **Evaluating the First Container**:
- The first container has clear water. This condition is ideal as it supports both fish and plant health. The plants can photosynthesize effectively, and the fish can breathe properly due to sufficient oxygen levels.

3. **Evaluating the Second Container**:
- The second container has a layer of oil on the surface. This layer will block light and reduce oxygen levels in the water, making it unsuitable for both fish and plants. The oil layer hinders photosynthesis and gas exchange.

4. **Evaluating the Third Container**:
- The third container contains suspended matter. This can cloud the water, limiting light availability for plants and affecting the oxygen levels, which can harm both fish and plants.

5. **Evaluating the Fourth Option (None of These)**:
- Since we have already identified that the first container is suitable, the option "none of these" is incorrect.

6. **Conclusion**:
- The first container, with clear water, will continue to have healthy fish and plants at the end of the week.

### Final Answer:
**Option 1 (Clear Water)** will continue to have healthy fish and plants at the end of a week.

---