An athlete is training for a race by performing timed trials of sprints up a staircase. Which set of varieties most directly affect the athlete’s power?

A. Bode weight, height climbed, width of steps
B. Body weight, time spent climbing, width of steps
C. height climbed, time spent climbing, Bode weight  
D. height climbed, time spent dimbing, width of steps

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Correct Answer: C