Birth control pills are a popular form of contraception for women. How do birth control pills prevent pregnancy?

Aby covering the cervix and blocking sperm from entering the uterus
Bby blocking the fallopian tubes and keeping the eggs from reaching the uterus
Cby introducing female hormones that prevent the ovaries from releasing eggs

Verified Answer :

The answer is: 
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   [C]:  by introducing female hormones that prevent the ovaries from releasing           eggs
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C.  

by introducing female hormones that prevent the ovaries from releasing eggs