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At a higher gross mass on a piston-engined aeroplane, in order to maintain a given angle of attack, configuration and altitude:
  • A
    the airspeed must be decreased and the drag will increase.
  • B
    the airspeed must be increased and the drag will remain unchanged.
  • C
    the airspeed must be increased and the drag will also increase.
  • D
    the lift/drag ratio must be increased.

Refer to figure.
High mass = high lift requirement

Therefore;
High lift induced drag = drag curve shifts to the right = increase in speed

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