Which source of water resupply is being used less often because it is not safe or fast as filling from a pressurized water supply?

The correct choice highlights that overhead-fill points are declining in usage primarily due to safety and efficiency concerns compared to pressurized water supplies. Overhead-fill points typically require firefighters to maneuver equipment in less-than-optimal situations, which can pose risks. Additionally, they often do not provide the rapid resupply necessary during high-pressure emergency scenarios where time is critical.

In contrast, options like pond fill stations, portable water tanks, and hydrant fill connections offer alternatives that may be easier and quicker to access in certain situations. Pond fill stations can be beneficial in rural areas where other sources are limited, and hydrant fill connections offer a direct line to municipal water supplies, enhancing speed and safety.

Focusing on overhead-fill points underscores the evolution of firefighting tactics towards maximizing efficiency without compromising safety, making them less favorable in modern operations.