Circle the one that is not a natural source of light: Bulb, Sun, Lightning, Stars

Explanation

To solve the question of identifying which option is not a natural source of light, we can follow these steps:

### Step 1: Understand the concept of natural sources of light
Natural sources of light are those that occur in nature and are not created by humans. Examples include the Sun, stars, and lightning.

### Step 2: Analyze each option
- **Bulb**: This is a man-made object that produces light when electricity passes through it.
- **Sun**: This is a natural source of light that provides light and heat to the Earth.
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