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Question

Please read the following paragraph and then answer the following questions.
Birth control methods act at many points in the reproductive cycle. Some options, such as birth control pills, are highly effective at preventing pregnancy. However, only a few commonly available methods are effective at preventing the transmission of sexually transmitted disease (STD). The Center for Disease Control estimates that each year about 10 million new STD infections strike people ages 15 to 24.
A diaphragm functions as a birth control device by ________.
A) preventing ovulation
B) preventing implantation of an embryo
C) stimulating the production of sperm-killing antibodies
D) preventing the movement of sperm into the uterus

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