According to the positive/negative symptom classification scheme for schizophrenia,

a. positive symptoms are made worse with drugs that increase dopamine.

b. people with positive symptoms have a poor outcome as they do not respond well to medications.

c. people with negative symptoms tend to develop their problems in adulthood.

d. delusions and hallucinations are examples of negative symptoms.

a.

Explanation:

The positive/negative symptom classification scheme states that individuals with schizophrenia experience both positive and negative cognitive difficulties. Such difficulties include hallucinations and delusions as a positive and lack of emotion or social functioning as a negative. According to this scheme for schizophrenia, positive symptoms are made worse by drugs that increase dopamine.