I believe the answer is a
The disorder that he might be at risk of experiencing schizophrenia. This is a mental disorder which usually appears in late adolescence or early adulthood. Normally characterized by hallucinations, delusions, and other cognitive difficulties. This condition affects how a person thinks, feels and behaves, although not common as compared to other disorders it can be very disabling and a lifelong struggle.
I believe the cerebrum is the largest part of the brain, so the answer should be C.
A. You improve your health by setting as many goals as you can
