As Described by the American College of Sports Medicine, Proper

As described by the American College of Sports Medicine, proper technique during the push-up test involves _____.

A) timing the number of push-ups performed in two minutes    
B) requiring both female and male subjects to use the toes as the pivotal point of movement
C) allowing a slight (20°) elbow flexion at the "top" of the movement
D) stopping the test when the subject strains forcibly