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Q22 Single choice

A running track with a hard surface makes for greater running speed than a soft one, at least under dry conditions, because even though step length is shorter on ' a hard surface, the time the runner's foot remains in contact with the running surface is less with a hard surface.

Which one of the following, if true, is evidence that the explanation given above is only a partial one?

A
Dry running conditions can be guaranteed for indoor track races only.
B
In general, taller runners have greater average step length than shorter runners do.
C
Hard tracks enhance a runner's speed by making it easier for the runner to maintain a posture that minimizes wind resistance.
D
The tracks at which the world's fastest running times have been recorded are located well above sea level, where the air is relatively thin.
E
To remain in top condition, a soft track surface requires different maintenance procedures than does a hard one.

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