The main disadvantages of a reciprocating pump over a Gear pump is that:

A. A gear pump is self priming while a reciprocating pump is not
B. Discharge of a gear pump is not affected by the direction of rotation while that of reciprocating pump is reversed
C. The discharge of reciprocating pump is pulsating and discharge rate is lesser
D. Reciprocating pumps are only available in high capacities and for smaller capacities only gear pumps can be used