Final answer:
Communicating about sex with strangers is a high-risk online behavior that could lead to sexual activity.
Step-by-step explanation:
Communicating about sex with strangers is the best example of a high-risk online behavior that could lead to sexual activity. When individuals engage in explicit conversations with people they don't know, it increases the risk of encountering sexual predators or engaging in unsafe activities. This behavior puts the person at a greater risk of being exploited or manipulated.
Learn more about Online behavior and sexual activity