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

### Question:
Ice will form on small ponds when the temperature drops below 0°C. Which property of ice is most beneficial to fish living in these ponds?

### Choices:
A. Ice has a temperature colder than the temperature of water.
B. Ice absorbs sunlight that is reflected by water.
C. Ice traps more pollution than is trapped by water.
D. Ice had a density lower than the density of water.

### Answer:
