Which of the following actions can help reduce the risks of STIs?

Abstinence is the most effective method for reducing the risks of sexually transmitted infections (STIs). By choosing to abstain from sexual activity, individuals eliminate the risk of exposure to STIs entirely, as these infections are primarily transmitted through sexual contact. This choice ensures that there is no exchange of bodily fluids that could lead to infection.

While other options may provide some level of risk reduction, they are not as effective. For instance, using contraception may prevent unwanted pregnancies but does not necessarily protect against STIs. Engaging in multiple relationships increases the likelihood of exposure to infections, and regularly consuming alcohol can impair judgment, potentially leading to riskier sexual behaviors. Thus, abstinence stands out as the most definitive way to avoid STIs.