The right answer is C.
To promote muscle development, bodybuilders establish bodybuilding programs that include exercises, combined with a strength training regime.
To gain mass, it is necessary to perform series of repetitions with progressive loads. The warm up and the respect of periods of recovery are two essential elements in the search for well inflated muscles.
A good bodybuilder is also someone who knows how to manage his work pace. By listening to his body, he can avoid the risks of overtraining.