This drawing shows a human body system. What is the primary function of this body system?

A. The transport of nutrients, water, and oxygen to body cells.

B. The chemical breakdown of food into smaller pieces.

C. The protection of vital organs from injury.

D. The production of hormones that regulate growth and metabolism.

its A ( the transport of nutrients,water,oxygen to body cells

Explanation:

I just did it :)

the reaction mixture contains some ammonia, plus a lot of unreacted nitrogen and hydrogen. the mixture is cooled and compressed, causing the ammonia gas to condense into a liquid. the liquefied ammonia is separated and removed. the unreacted nitrogen and hydrogen are then recycled back into the reactor .