Planet that reflects highest percentage of light:

Options

A. Mars
B. Mercury
C. Venus
D. Earth

Explanation

**Step-by-Step Solution:**

1. **Understanding Albedo**: Albedo is a term used in meteorology that refers to the percentage of light that is reflected by a surface. It helps us understand how much sunlight is absorbed or reflected by different celestial bodies.

2. **Identifying the Planets**: The question asks which planet reflects the highest percentage of light. The options given are:
- Mars
- Mercury
- Venus
- Earth

3. **Analyzing Each Option**:
- **Mars**: Mars has a relatively low albedo, reflecting less sunlight compared to other planets.
- **Mercury**: Mercury also has a low albedo, reflecting only a small percentage of light.
- **Earth**: Earth has a moderate albedo, reflecting a fair amount of sunlight but not the highest.
- **Venus**: Venus is known for its thick cloud cover, which reflects a significant amount of sunlight.

4. **Conclusion**: Among the options, Venus has the highest albedo, reflecting about 70% of the sunlight that hits it. This makes it the most reflective planet in our solar system.

5. **Final Answer**: Therefore, the planet that reflects the highest percentage of light is **Venus** (Option 3).

---