Which activity is the best example of the mastery hypothesis?
a) a royal ballet dancer learning a new dance move
b) an olympic gymnast learning to play tennis
c) a world cup soccer player practicing kicking
d) a wimbledon tennis player practicing backhand swings

The mastery hypothesis: the mere fact that they are exercising makes patients feel like they have achieved something, cheering them up much as learning a new hobby or achieving a certain goal might cheer them up.

That sounds like B to me.

b.working on a weight lost for a patient

explanation:

answer; i believe the answer is moderate level;