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

### Question:
A student puts two identical plants in the same type and amount of soil. She gives them the same amount of water. She puts one of these plants near a sunny window and the other in a dark room. This experiment tests how the plants respond to

### Choices:
A. light
B. air
C. water
D. soil

### Answer:
