How does a diaphragm prevent pregnancy?

A diaphragm is a barrier method of birth control.  A barrier method poses a barrier between the sperm and the egg.  

Explanation:

A diaphragm fits over the cervix (entrance of the uterus) and prevents the sperm from finding the egg.  As a rule, to increase the success rate of the diaphragm, a spermicide (sperm killing agent), in the form of a gel substance, is applied to the diaphragm before it is inserted into the vagina.

d. it blocks the crevix in order to keep sperm from entering the uterus.

Explanation:

Imagine covering ur penis with a diaphragm. Makes no sense. D is the right answer

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