produce hormones that regulate body functions form chemicals that destroy microbes break down food to release nutrients supply red blood cells to carry oxygen
I gave my students this multiple choice question: The primary role of the endocrine system is to

Only one answer is correct among these 4 choices:
- produce hormones that regulate body functions
- form chemicals that destroy microbes
- break down food to release nutrients
- supply red blood cells to carry oxygen

Could you tell me which one is correct?

produce hormones that regulate body functions