The chemical produced by the body to control such as growth and reproduction is called hormones. It is secreted through Endocrine gland
Explanation:
The main role of hormone is to communicate with body. it releases through blood stream. it also creates change in those cells which is near of its surrounding tissue. it works with nervous and immune system. It helps our body cope with different events and stresses.
It controls blood sugar in our body. The main role of this gland is "growth, repair and reproduction". it also includes development of brain
You can automatically eliminate B and D because they have little to do with the movement of the body. And it's not A because the skeletal system doesn't have the signals to tell the muscular system what to do.