Final answer:
The motor-driven centrifugal pump delivers 15 gallons per minute, which is the measure of the fluid flow rate that the pump can achieve.
Step-by-step explanation:
A motor-driven centrifugal pump delivers 15 gallons per minute (C). The discussion provided indicates that substantial power is needed for large pumps, such as those on fire trucks, and that when a pump like a heart increases water's velocity, pressure, and height, multiple terms must be considered to calculate the power supplied. In the case of the centrifugal pump mentioned, it is typically used to move fluids through a system by converting rotational kinetic energy to hydrodynamic energy of the fluid flow, and the unit of measure that is appropriate for the flow of a fluid is gallons per minute.
In an example provided, a pump supplies power to increase water pressure without changing the water's speed or height, therefore only affecting the pressure component. This particular measurement pertains to the performance capability of the pump in terms of how much fluid it can move, which is expressed as gallons per minute.