A Client Has Decided to Use the Oral Contraceptive Norethindrone

A client has decided to use the oral contraceptive norethindrone (Ortha Micronor) .How can the nurse most accurately explain the way progestin-only contraceptives help to prevent pregnancy?

A) Progestin-only pills thicken the cervical mucus and discourage the sperm from entering the uterus."
B) The pill you have decided to take prevents the egg that is in the ovary from becoming mature."
C) These pills prevent ovulation just like the combination pills do."
D) Pills that contain progestin alone prevent pregnancy by preventing the release of follicle-stimulating hormones (FSH) ."