To Use a Cadence That Is Twice as Fast as the Beat

To use a cadence that is twice as fast as the beat of a piece of music for a fast sprint cadence:

A) One leg pushes down on the beat and the other leg pushes down on the off or back beat.
B) One leg pushes down on the beat and on the off-beat while the other pulls up.
C) One leg pushes down on every other beat.
D) Pick a very energetic track and tell participants to pedal as fast as they can.