A fitness center is interested in the average amount of time a client exercises in the center each week. Define the following in terms of the study. Give examples where appropriate. (Multiple choice)

Population :
(A) The population is all of the clients of the fitness center.
(B) The population is the total amount of time a client exercises in one week.
(C) The population is all of the clients that use the fitness center for a given week.
(D)) The population is all of the clients sampled by the fitness center.