The muscular system consists of the skeletal muscles muscles

The muscular system consists of the skeletal muscles muscles of the heart and those in the walls of the hollow organs skeletal muscles and the muscles of the heart muscles of the heart muscles in the walls of hollow organs

Solution

Answer is skeletal muscles if you consider only voluntary muscles which can be mobed at our will as part of muscular system

If skeletal muscles (voluntary), cardiac muscle (involuntary) and smooth muscles (involuntary) are considered as part of the muscular system, then the answer is multiple options :