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

### Question:
A student stirred some sand into a container of water and left the mixture alone for several hours until the sand settled on the bottom of the container. Which statement best explains why the sand separated from the water?

### Choices:
A. Sand particles are denser than water.
B. Water is a liquid and sand is a solid.
C. The sand was insufficiently stirred.
D. There was more sand than water.

### Answer:
