Final answer:
Abstinence is the sole guaranteed method to prevent STI transmission and pregnancy.
Explanation:
Abstinence is the only 100% effective way to prevent the transmission of STIs and pregnancy. By completely avoiding direct contact of skin and bodily fluids through abstaining from all forms of sexual activity, individuals can protect themselves from STIs and unwanted pregnancies.
Learn more about Abstinence here:
https://brainly.com/question/40446359
