Mechanical power is produced by electric motors that are mainly used to drive pumps, for example, fuel and hydraulic pumps or to drive a valve to the commanded position in the fuel, hydraulic or air conditioning system or to move mechanical parts like doors and cargo containers.

【单选题】
A A. You can use electric motors to drive fuel and hydraulic pumps or to drive a valve to the commanded position in the fuel, hydraulic or air conditioning system or to move doors and cargo containers.
B B. Electric motor can drive fuel and hydraulic pumps or drive a valve to the commanded position in the fuel, hydraulic or air conditioning system or move mechanical parts like doors and cargo containers to produce mechanical power.
C C. Electric motor produce mechanical power and their main functions are to drive fuel and hydraulic pumps, to drive a valve to the commanded position and to move mechanical parts like doors and cargo containers.

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