The Coast Guard had been monitoring the strong winds and high waves. The Coast Guard Cutter Florida was headed toward the beach to warn swimmers about the danger. They were ready to post red flags warning of a strong undercurrent. Over the summer, many swimmers had been rescued. The coastal beachfront was especially prone to a strong undercurrent because of the Gulfstream. Several guard members on the boat watched the scene unfold as the cutter headed toward shore. They saw two surfboarders heading toward a small raft with a young child inside. The raft was close to flipping over. They were ready to post red flags warning of a strong undercurrent.

What explicit idea is expressed in this sentence? (5 points)

Group of answer choices

The Coast Guard warns swimmers about dangerous waters.

The kids were too busy trying to reach the boy to realize they were being watched.

Other swimmers earlier in the summer did not have a warning.

The beach was not watched by the Coast Guard.