Which statement best describes the factors that affect muscular endurance?
a. size of the muscle cells, ability to store fuel, and blood supply to the muscles
b. number of muscles, amount of exercise, and type of person
c. level of flexibility, amount of exercise, and ability to store fuel
d. blood supply to the muscle, type of exercise, and type of muscle cells

The answer is A. Size of the muscle cells, ability to store fuel, and blood supply to the muscle

Muscle endurance : The ability of your muscle to do continuous work over a long period of time

Size of muscle Cells : Affect muscle strength
Ability to store fuel : Affects energy storage to do work
Blood Supply to the muscles : Affect muscle durability ( prevent injury)