What should happen to pool operations during rain?

The correct answer emphasizes that pools should close if visibility to the bottom is compromised, as this directly relates to ensuring the safety of swimmers. When rain occurs, especially heavy rain, it can lead to decreased visibility in the water due to mud, debris, or other disturbances. Ensuring that lifeguards can see the bottom of the pool is critical for safety because it allows them to monitor swimmers effectively and respond to emergencies promptly.

Additionally, maintaining visibility helps prevent accidents or drownings, as lifeguards can spot any potential hazards or swimmers in distress. While it may be true that some pool operations can continue in light rain, the inability to see the bottom is a more serious concern that warrants closing the pool to protect all swimmers.

Other options may suggest a range of actions, but they do not address the critical issue of visibility and safety as directly as the chosen answer does.