If You Drive at the Posted Speed Limit of 70 $\times$

Multiple Choice

If you drive at the posted speed limit of 70 mph on the interstate, what is the fraction of your speed compared to the speed of light?

A) 6.48 $\times$ 10^-8
B) 1.04 $\times$ 10^-7
C) 2.33 $\times$ 10^-7
D) 3.73 $\times$ 10^-7
E) None of these is correct.