A study compared the energy expenditures of professional bicycle racers and average recreational bicycle riders while climbing a hill. Surprisingly, the professional bicycle riders not only reached the top of the hill significantly quicker than the recreational cyclists but also expended at least 20% less energy while doing so.
Which of the following hypotheses best explains why the professional cyclist performed faster, but used less energy?
A. Hill climbing is considered one of the most important skills for a serious professional cyclist.
B. A survey of mood and attitude reported that the professional cyclists felt much better after completing the hill climb than did the recreational cyclists.
C. Professional cyclists, as compared with recreational cyclists, have techniques that optimize gear use and riding position.
D. All cyclists expend the greatest energy at the start of the hill climb when they must not only ascend the hill but also accelerate.
E. Not all of the professional bicycle racers were specialist hill climbers.