The stars appearing ............ have lowest surface temperature.

Options

A. red
B. blue
C. yellow
D. white

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks which type of stars have the lowest surface temperature. We need to identify the colors of stars and their corresponding temperatures.

2. **Identifying Star Colors**: The common colors of stars include red, blue, yellow, and white. Each color corresponds to a different temperature range.

3. **Temperature Ranges**:
- **Blue Stars**: These stars are the hottest, with surface temperatures ranging from about 10,000 K to 50,000 K.
- **White Stars**: These stars have moderate temperatures, typically between 7,500 K to 10,000 K.
- **Yellow Stars**: These stars have temperatures around 5,500 K to 7,500 K.
- **Red Stars**: These stars have the lowest temperatures, generally ranging from about 2,500 K to 3,500 K.

4. **Comparing Temperatures**: By comparing the temperature ranges, we can see that red stars have the lowest surface temperature compared to blue, yellow, and white stars.

5. **Conclusion**: Therefore, the stars appearing red have the lowest surface temperature.

**Final Answer**: The stars appearing **red** have the lowest surface temperature.

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