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Jane is using progestin-only pills. Which of the following best explains how this form of birth control protects her from an unplanned pregnancy?

A) It prevents the release of an egg.
B) It kills sperm.
C) It thickens cervical mucus and interferes with implantation.
D) It thickens the lining of the fallopian tubes to impede the travel of both egg and sperm.