Scientific studies show that schizophrenia has a strong genetic component. This means that if Bill has a sibling with schizophrenia, Bill is

A. at a higher risk for schizophrenia than an unrelated person.

B. going to develop schizophrenia himself.

C. at a higher risk for other types of psychological illness.

D. less likely to respond to schizophrenia medications if he develops the illness.