Irth control pills are a popular form of contraception for women. how do birth control pills prevent pregnancy? 1) by covering the cervix and blocking sperm from entering the uterus 2) by blocking the fallopian tubes and keeping the eggs from reaching the uterus 3) by introducing female hormones that prevent the ovaries from releasing eggs

The correct answer is:  

       3)  "by introducing female hormones that prevent the ovaries from releasing eggs" . 

      Note that "birth control pills" are also prescribed to girls/women for
  "hormone replacement therapy" (e.g. to help prevent/reduce menstrual        cramps/ symptoms of "hot flashes"/ "menstrual migraines"/ irregular                periods/ including those symptoms associated with menopause. 

   In other words—and put simply—birth control pills are "hormone pills" .

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