Which one of the following is a WRONG statement?

• A. The head generated by a centrifugal pump at zero discharge is the ‘shutoff head’.
• B. To avoid cavitation in centrifugal pumps, the net positive suction head should be more than the theoretical atmospheric pressure.
• C. According to the affinity laws of centrifugal pumps, the head varies with the square of the impeller speed.
• D. Most of the turbine pumps have operational characteristics closer to those of the centrifugal pumps than the propeller pumps.