Question

what is the easiest, least expensive, and best way to avoid getting stis? p.s. this one is a gift!
abstinence (dont have sexual intercourse)
abstinence (avoid sexual intercourse)
abstinence (dont have sex)

Explanation:

STIs (Sexually - Transmitted Infections) are mainly transmitted through sexual contact. Abstinence eliminates the risk of exposure to STI - causing pathogens through sexual activity, making it the easiest, least - expensive, and most effective way to avoid getting STIs without the need for additional medical or contraceptive measures.

Answer:

All of the above (since all options essentially describe abstinence which is the best way to avoid STIs)