The Sibling of a Pediatric Client Diagnosed with Leukemia Expresses

The sibling of a pediatric client diagnosed with leukemia expresses feelings of anger and guilt to the nurse. Which explanation should the nurse provide to the client's parents regarding the reaction of the sibling?

A) Abnormal; the sibling should be referred to a psychologist.
B) Unexpected; the cancer is easily treated.
C) Unusual; the illness does not affect the sibling.
D) Normal; the sibling is affected, too, and anger and guilt are expected feelings.