The cooking in refrigerator is due to:

Options

A. Reaction of the refrigerator gas
B. Expansion of ice
C. The expansion of the gas in the refrigerator
D. The work of the compressor

Explanation

To solve the question regarding the cooling in a refrigerator, we will analyze the options provided and determine the correct reason for the cooling effect.

### Step-by-Step Solution:

1. **Understanding the Function of a Refrigerator**:
- A refrigerator operates on the principle of removing heat from the interior and expelling it to the outside environment. This process involves the use of a refrigerant that undergoes phase changes.

2. **Analyzing the Options**:
- **Option A: Reaction of the refrigerator gas**: This option suggests that a chemical reaction is responsible for cooling, which is not accurate in the context of how refrigerators work.
- **Option B: Expansion of ice**: Ice does not expand in a way that contributes to cooling; rather, it absorbs heat when it melts.
- **Option C: Expansion of the gas in the refrigerator**: This option refers to the physical process where the refrigerant gas expands, leading to a drop in temperature as it absorbs heat from the surroundings.
- **Option D: Work of the compressor**: While the compressor does play a role in the refrigeration cycle, its primary function is to compress the refrigerant gas, which does not directly cause cooling.

3. **Identifying the Correct Reason**:
- The cooling effect in a refrigerator is primarily due to the **expansion of the gas**. When the refrigerant gas expands, it absorbs heat from the interior of the refrigerator, leading to a cooling effect.

4. **Final Answer**:
- The correct answer is **Option C: The expansion of the gas in the refrigerator**.

### Summary:
The cooling in a refrigerator is due to the expansion of the gas, which absorbs heat from the interior, resulting in a cooling effect.