A boy ran a distance of 200m in 24s. His average speed was 8.3ms^-1. Which of the following is correct about the units in which the statements above are expressed?

A. All the units are fundamental.
B. All the units are derived
C. All the units except one are S.I units
D. Two of the units are fundamental and one derived.  
E. None of the units is S.I units.

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Correct Answer: D