Jack has heard from some of his teammates that drinking a high protein supplemen

Question

Jack has heard from some of his teammates that drinking a high protein supplement after football training will improve his muscle mass. He decides to test this hypothesis by comparing the muscle mass of teammates who drink the high protein drink with a control group who drink only water. Which of the following would be the best control for his experiment?

Volunteers from the football team who agree to take a placebo instead of a protein drink

Randomly selected teammates who are given only small amounts of a protein drink

Volunteers from the general campus population who are not given any protein drink

Randomly selected teammates in training who are given a placebo instead of a protein drink

Volunteers from the football team who agree to take a placebo instead of a protein drink

Randomly selected teammates who are given only small amounts of a protein drink

Volunteers from the general campus population who are not given any protein drink

Randomly selected teammates in training who are given a placebo instead of a protein drink

Explanation / Answer

I think that A

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