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

### Question:
A student proposes the rate of increase in a plant's mass will be proportional to the length of light exposure per day when all other variables are constant. How should this proposal be classified?

### Choices:
A. as a hypothesis
B. as a conclusion
C. as a theory
D. as a statement

### Answer:
