Parents of a 12 –year-old girl ask why their nonsexually active daughter should . receive the human papillomavirus (hpv) vaccine. the nurse should tell the parents: a."the vaccine is most effective against cervical cancer if given before becoming sexually active." b."parents are never sure when their child might become sexually active." c."hpv is most common in teens and women in their late 20's." d."if your daughter is sexually assaulted, she may be exposed to hpv."