The primary function of the system is to supply nutrition for the body in a form that the body can use

Circulatory

Explanation:

The Circulatory System, which is part of the "Cardiovascular" System, is one of the eleven organ systems of the human body. Its main function is to transport nutrients to cells and wastes from cells.

not quite sure but i think its

absolute strength refers to the maximum force exerted by a body irrespective of body size. relative strength on the other hand is the force exerted by a body in relation to muscle size or body weight.

so the answer is: c. absolute strength measures strength regardless of your body size, while relative strength measures strength adjusted for your weight.