Matthew, Age 18 Months, Has Just Been Admitted with Croup

Matthew, age 18 months, has just been admitted with croup. His parent is tearful and tells the nurse, "This is all my fault. I should have taken him to the doctor sooner so he wouldn't have to be here." Which of the following is appropriate in the plan of care for this parent who is experiencing guilt?

A) Clarify misconception about the illness.
B) Explain to parent that the illness is not serious.
C) Encourage parent to maintain a sense of control.
D) Assess further why parent has excessive guilt feelings.