D
Below is a question with multiple-choice answers. Choose the correct option based on your reasoning.

### Question:
One evening as it is getting dark, Alex sits on the front porch and watches the sun slowly disappear behind the neighbor's house across the street. Which explains this observation?

### Choices:
A. The sun's light is reflected by the clouds.
B. The sun's light is refracted by the atmosphere.
C. The sun moves from west to east each day.
D. The sun appears to move due to Earth's rotation.

### Answer:
