Bananas can be prevented from overripening by

Options

A. maintaining them at room temperature
B. refrigeration
C. dipping in ascorbic acid solution
D. storing in a freezer

Explanation

**Step-by-Step Solution:**

1. **Understanding the Problem:**
- The question asks how bananas can be prevented from overripening. Overripening is a process that leads to the deterioration of the fruit, making it unpalatable.

2. **Role of Ethylene:**
- Ethylene is a natural plant hormone that promotes fruit ripening. It is produced by the fruit itself and can accelerate the ripening process.

3. **Use of Ethyphon:**
- Ethyphon is a compound that releases ethylene when it decomposes. It is used in agriculture to control the ripening of fruits. When injected into the stems of bananas, it leads to a slow release of ethylene gas, promoting ripening.

4. **Temperature's Effect on Ripening:**
- Lowering the temperature can slow down the metabolic processes in fruits, including the activity of enzymes responsible for ripening. This is because enzymes are less active at lower temperatures.

5. **Refrigeration vs. Freezing:**
- Refrigeration slows down ripening but may not be sufficient to completely prevent overripening. Freezing, on the other hand, significantly reduces the temperature and can halt the enzymatic activity more effectively.

6. **Conclusion:**
- To prevent bananas from overripening, the best method is to store them in the freezer, as this will significantly reduce the temperature and inhibit the enzymes involved in the ripening process.

**Final Answer:**
Bananas can be prevented from overripening by storing them in the freezer.

---