Matt's Mother Tells the Nurse That He Keeps Scratching the Areas

Matt's mother tells the nurse that he keeps scratching the areas where he has poison ivy. The nurse's response should be based on which of the following?

A) Poison ivy does not itch and needs further investigation.
B) Scratching the lesions will not cause a problem.
C) Scratching the lesions will cause the poison ivy to spread.
D) Scratching the lesions may cause them to become secondarily infected.