Q. With reference to manometric head which of the following statements is correct?

• (A) It is the head developed by the pump.
• (B) It is the height to which water is lifted by the pump measured above the pump centreline.
• (C) it is the difference in elevation between the water surface in the high level reservoir and the water level in the sump.
• (D) It is the difference in the piezometric heads between the points on the delivery and suction pipes as close to the pump as possible.