[Verified Answer]: A 20-year-old woman presents to a provider…

A 20-year-old woman presents to a provider following unprotected intercourse with her boyfriend 10 hours ago. She tells the provider that although they usually use barrier contraception, this time they did not, and she does not want to become pregnant. After counseling, the provider prescribes an enteric-coated pill containing 1.5 mg of levonorgestrel. Which of the following is the primary mechanism of action of levonorgestrel? A. It delays ovulation by inhibiting follicular development. B. It thickens the cervical mucus. C. It causes atrophy of the endometrium. D. It stimulates mucosal hypertrophy and polyp formation in the cervix. E. It causes the shedding of an implanted embryo.