When the light is very bright,

Options

A. the iris makes the pupil expand
B. the iris makes the pupil contract
C. the iris and the pupil remain as they are
D. none of these

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks what happens to the pupil of the eye when a lot of light enters it.

2. **Identifying the Role of the Iris**: The iris is the colored part of the eye that controls the size of the pupil. It adjusts the amount of light that enters the eye.

3. **Response to Bright Light**: When there is a lot of light (bright light), the iris reacts by contracting. This means that it reduces the size of the pupil.

4. **Mechanism of Contraction**: The contraction of the iris decreases the area of the pupil, limiting the amount of light that can enter the eye. This is a protective mechanism to prevent damage to the retina from excessive light.

5. **Conclusion**: Therefore, when a lot of light enters our eyes, the iris contracts the pupil. The correct answer to the question is that the iris makes the pupil contract.

### Final Answer:
The iris contracts the pupil when a lot of light enters the eyes.

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