Which of the following is a common hazard that lifeguards must watch for at the beach?

The correct choice identifies jellyfish, rip currents, and sharp objects as common hazards that lifeguards need to be vigilant about at the beach.

Jellyfish can pose a significant risk to swimmers due to their stinging tentacles, which can cause severe pain or allergic reactions in people who come into contact with them. Lifeguards must be aware of the presence of jellyfish in the water and inform beachgoers to be cautious.

Rip currents are powerful, narrow channels of water that flow away from the shore and can pull swimmers out to deeper water. Recognizing and understanding rip currents is crucial because they are one of the leading causes of rescues at the beach. Lifeguards must monitor surf conditions and provide guidance to the public about safe swimming areas.

Sharp objects, such as broken glass, debris, or metal from beach equipment, can cause injuries to swimmers and beachgoers. Lifeguards often need to monitor the beach for these hazards to ensure a safe environment.

In contrast, focusing solely on high tides or sunbathers overlooks the broader range of dangers present at the beach. While beachgoers are part of the community that lifeguards serve, "friendly beachgoers" does not represent a hazard. Additionally,