When it is raining, the dew point is

Options

A. `0^@C`
B. `50^@C`
C. `100^@C`
D. room temperature

Explanation

To determine the dew point when it is raining, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Dew Point**: The dew point is defined as the temperature at which air becomes saturated with moisture. This means that the air can no longer hold all the moisture, leading to condensation.

2. **Relation Between Temperature and Moisture**: Warmer air can hold more moisture compared to cooler air. As the temperature of the air decreases, it reaches a point where it can no longer hold all the moisture, resulting in the formation of dew or rain.

3. **Condition When It Rains**: When it is raining, the air has reached its saturation point. This occurs when the temperature of the air drops to the dew point temperature.

4. **Identifying Dew Point Options**: The options provided are:
- 0°C
- 3°C
- 100°C
- Room Temperature

5. **Analyzing the Options**:
- 0°C and 3°C are relatively low temperatures and would not typically represent the dew point in a warm, humid environment where rain is occurring.
- 100°C is too high for a dew point under normal atmospheric conditions.
- Room temperature, which is generally around 20°C to 25°C, is a more realistic temperature for the dew point when it is raining.

6. **Conclusion**: Therefore, when it is raining, the dew point is at room temperature, as this is the temperature at which the air is saturated with moisture leading to precipitation.

### Final Answer:
The dew point when it is raining is at room temperature.