If a mobile water supply apparatus is equipped with a fire pump, what is the minimum requirement for soft suction hose?

Answer: C — 15 ft (4.5 m)

The correct answer is based on the established guidelines that dictate the specifications for soft suction hose used with mobile water supply apparatuses equipped with fire pumps. The minimum requirement for soft suction hose is 15 feet (4.5 meters). This length is adequate to ensure that the pump can efficiently draft water from a static source, such as a hydrant or a body of water, while maintaining a functional distance for various operational scenarios. In practice, having at least 15 feet of soft suction hose allows for flexibility in different types of water supply situations, including the need to maneuver around obstacles or to position the apparatus effectively. Any requirement shorter than this may compromise the ability of the fire pump to perform optimally, while longer lengths, such as those listed in other options, may not be necessary for achieving efficient operation in typical situations.