Which of these would be most likely to negatively influence brett toward marijuana addiction?

a. role models
b. peers
c. family
d. heredity

It would be most likely B. Peers

People are usually mostly influenced by peers, the people they hang around most. 

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)

Phallus or pelvis or scroutum