Final answer:
Sally, who believes she is a powerful person who can save the world, is experiencing delusions of grandeur, which is a symptom of schizophrenia where individuals have exaggerated beliefs about their own importance. The correct answer is b. delusions of grandeur.
Step-by-step explanation:
Sally, who is diagnosed with schizophrenia and believes she is a powerful person who can save the world, is experiencing delusions of grandeur. This type of delusion involves a person having an exaggerated sense of their own importance, power, knowledge, or identity.
Schizophrenia is a complex mental health disorder that can cause a range of symptoms, including hallucinations and delusions, as well as 'negative' symptoms like emotional flatness and loss of pleasure. Treatment for schizophrenia typically includes antipsychotic medications which work by affecting neurotransmission in the brain, commonly by blocking dopamine receptors.