Final answer:
The correct option for a centrifugal pump located above the source of supply with a suction line equipped is a foot valve.
Step-by-step explanation:
The correct option for a centrifugal pump located above the source of supply with a suction line equipped is B) foot valve.
A foot valve is a type of check valve that is installed at the end of a suction pipe to prevent the liquid from flowing backward when the pump is not in operation. It allows the pump to maintain a prime, ensuring that the pump is always filled with liquid, ready for operation.
A foot valve typically has a screen or strainer to prevent debris or large particles from entering the pump.