Which of the following is a non-luminous body?

Options

A. Fire
B. Sun
C. Stars
D. Earth

Explanation

To determine which of the following is a non-luminous body, we need to first understand the definition of luminous and non-luminous bodies.

### Step-by-Step Solution:

1. **Understand the Definition of Luminous Bodies**:
- Luminous bodies are those that emit their own light. Examples include the Sun, stars, and fire.

2. **Analyze the Given Options**:
- The options provided are:
- A) Fire
- B) Sun
- C) Stars
- D) Earth

3. **Evaluate Each Option**:
- **Fire**: Produces light through combustion, making it a luminous body.
- **Sun**: A massive star that emits light due to nuclear fusion, hence it is a luminous body.
- **Stars**: Similar to the Sun, stars produce light through nuclear reactions, categorizing them as luminous bodies.
- **Earth**: Does not emit its own light; it reflects light from the Sun, which makes it a non-luminous body.

4. **Identify the Non-Luminous Body**:
- Based on the evaluations, the Earth is the only option that does not produce its own light. Therefore, it is classified as a non-luminous body.

5. **Conclusion**:
- The correct answer to the question "Which of the following is a non-luminous body?" is **Earth**.

### Final Answer:
**Earth** is the non-luminous body among the options provided.