Which of the Following Statements by a Client Indicates a Good

Which of the following statements by a client indicates a good understanding of the effectiveness of different birth control methods?

A) "Progestin-only oral contraceptives are only about 80% effective in preventing pregnancy."
B) "Depot injections are about 95% effective if injections are given weekly."
C) "Combination oral contraceptives are 100% effective if taken correctly."
D) "The Mirena IUD is effective at preventing pregnancy for at least 10 years."