Mehran heard that drinking a high protein supplement after football training would improve his muscle mass. To test his hypothesis, the experimental group would receive a high protein drink and the control group would drink only water. Who should be selected for the control group in this experiment?

A) randomly selected teammates who are given only small amounts of a protein drink
B) randomly selected teammates in training who are given a placebo instead of a protein drink
C) volunteers from the general campus population who are not given any protein drink
D) volunteers from the football team who agree to take a placebo instead of a protein drink