Me if strictly practiced, which of the following methods of birth control is 100 percent effective? abstinence condoms withdrawal diaphragm with spermicide

Abstinence (from heterosexual sex) is the only method listed that is 100% effective at preventing pregnancy. When the other methods are used for pregnancy prevention during sex between a sperm-producing body and an egg-producing body, there is the possibility that some sperm will still come into contact with an egg.

Yo no me sé esa mala mia

Your answer should be 1/3. i hope i could ! good luck : )