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

### Question:
In December, one side of Earth will receive less energy from the Sun than the other side. Which statement best explains this fact?

### Choices:
A. Earth rotates on its axis.
B. Earth is tilted on its axis.
C. Sunlight traveling to Earth reflects off the Moon.
D. Sunlight traveling to Earth is blocked by Moon.

### Answer:
