The teenager with a fiberglass cast asks the nurse if it will be okay to allow his friends to autograph his cast. Which response would be best?

C If they don't use chalk to autograph, it is okay. B Because the cast is made of plaster, autographing can weaken the cast. D Autographing or writing on the cast in any form will harm the cast. A It will be alright for your friends to autograph the cast.