18. What's the purpose of a successive beneficiary provision? A. It prohibits the insured from changing an irrevocable beneficiary unless the beneficiary is deceased. B. It allows the insurer to pay up to $1,500 to anyone who has paid for the insured's funeral expenses or medical bills. C. It allows the insured to name children as contingent beneficiaries. D. It allows the insurer to pay policy proceeds to certain classes of persons if there is no surviving named beneficiary