The _________is a transparent hole through which light enters our eyes.

Options

A. Iris
B. Cornea
C. Sclera
D. Pupil

Answer

To answer the question: "The _________ is a transparent hole through which light enters our eyes," we need to identify the correct term that fits in the blank.

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for a specific part of the eye that allows light to enter. We need to find a term that describes a transparent opening.

2. **Identifying Parts of the Eye**: The eye has several important parts, including the cornea, iris, and pupil. Each part has a specific function related to vision.

3. **Analyzing Each Part**:
- **Cornea**: This is the outer layer of the eye that helps to focus light but is not a hole. It is transparent but does not allow light to enter directly.
- **Iris**: This part gives color to the eye and controls the size of the pupil but is not a hole.
- **Pupil**: This is the small, dark opening in the center of the iris that allows light to enter the eye. It is indeed a transparent hole.

4. **Conclusion**: Based on the functions of these parts, the correct answer to fill in the blank is "pupil."

Thus, the complete sentence reads: "The **pupil** is a transparent hole through which light enters our eyes."