Which Response Is Appropriate When a Patient's Mother Expresses Guilt

Which response is appropriate when a patient's mother expresses guilt over "causing my child to be schizophrenic"?

A) "I can see how you would be upset over this turn of events."
B) "New findings suggest this disorder is biological in nature."
C) "Don't be so hard on yourself; your daughter needs you to be strong."
D) "It's difficult to see what produces stress for the child at the time it's occurring."