The only way to truly prevent STD's and provide 100% effective protection is:

• A. Safe sex practices
• B. Monogamous relationship
• C. Abstinence
• D. No sex at all times

Answer: (C)

The main idea is that true, 100% protection from STDs comes only from avoiding sexual contact. Abstinence means refraining from all sexual activity, so there’s no exposure to infections that are transmitted during sex, which is why it guarantees zero risk.

Other options reduce risk but don’t eliminate it. Safe sex practices like using condoms significantly lower the chance of transmission, but they don’t cover every possible route (such as infections transmitted by skin-to-skin contact outside the covered areas), and effectiveness depends on correct and consistent use. A monogamous relationship can lower risk if both partners are truly uninfected and stay faithful, but it isn’t a guarantee because infections can be undetected for a while, partners’ histories may be unknown, and testing isn’t perfect. Since any sexual activity can potentially transmit an STD, abstinence is the only approach that provides 100% protection.