Advertising is actually part of a comprehensive effort.

marketing
production
competition
pricing

d is wrong

There is a lot of things if u give me the list i can

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)

D. contract and relax