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

### Question:
A researcher observes that an organism placed in a glass container filled with water moves away when a penlight is focused on the container. The researcher concludes that the organism is light sensitive. Which other explanation for the organism's response to the light is most possible?

### Choices:
A. The organism avoids radio waves.
B. The organism avoids gamma rays.
C. The organism moves away from vibrations.
D. The organism moves away from heat sources.

### Answer:
