I believe the answer is A
Exercise intensity refers to how much energy is expended when exercising. Perceived intensity varies with each person. It has been found that intensity has an effect on what fuel the body uses and what kind of adaptations the body makes after exercise.
The right answer is digestive. Cause when you hear gallstone it is digestion most of the time.
I'm THINKING C because a again you normally inject in the arm and the bicep is part of the arm acctually maybe E!