What Is the Nurse's Best Response to a Mother Whose

What is the nurse's best response to a mother whose child has a diagnosis of acute lymphoblastic leukemia and is expressing guilt about not having responded sooner to her boy's symptoms?

A) "You should always call the physician when your child has a change in what is normal for him."
B) "It is better to be safe than sorry."
C) "It is not uncommon for parents not to notice subtle changes in their children's health."
D) "I hope this delay does not affect the treatment plan."