Otc medications are approved by the fda to be a. safe to be sold directly to consumers. b. administered only by a physician. c. administered only under healthcare provider supervision. d. prescribed by a nurse.

Since OTC is "over the counter" as in you can walk in a store and buy them, the correct answer would be A

The person who utilize the progression principle will keep adding the difficulty of the exercise that he's doing, while the person who does not, will only stay stagnant.  the person that utilize progression principle, will get a stronger endurance because now his body is conditioned to do harsher routines.{the answer was already on verified)