A Patient Mentions,"No One Else I Know Is Mentally Ill

A patient mentions,"No one else I know is mentally ill." What reply would help the patient understand the extent of mental illness?

A) "You are not unique; many people experience mental illness."
B) "Let's concern ourselves with you and getting you well again."
C) "Being among people who understand your problem and want to help is what is important."
D) "You are truly not alone; almost 50% of adults experience some kind of mental illness.