Why Do So Few Sperm Ever Reach the Fallopian Tubes

Why do so few sperm ever reach the fallopian tubes after intercourse?

A) Most leak from the vagina or are destroyed by the vaginal environment.
B) A majority of sperm are deformed and, thus, cannot swim effectively through the cervix.
C) Most sperm cannot pass through the cervix because of its position relative to the vagina.
D) Unless a female orgasm occurs, the cervix closes during the resolution period.

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