The body system seen here protects internal structures, provides support, and allows for movement. but this system does not work alone. in order for humans to move, this system must work together with the system. a) circulatory b) digestive c) muscular d) respiratory

C) muscular

Explanation:

The system that provides the support, protects the internal structures and allows the movement is known as the skeletal system composed of the bones.

The skeletal system is unable to perform all the function on its own but is associated with another system called the muscular system composed of various type of muscles especially skeletal muscles and together form the musculoskeletal system.

The association of these system increases the efficiency of each other and thus together support, provides stability and helps in the movement in the body.

Thus, Option-C is the correct answer.