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

### Question:
Stretching is considered an important step before engaging in sports. In an investigation to see whether stretching before physical exertion reduces sports injuries, who would the control group most likely be?

### Choices:
A. athletes who stretch before working out
B. non-athletes who stretch before working out
C. athletes who do not stretch before working out
D. non-athletes who do not stretch before working out

### Answer:
