The Correct Value for the Speed of Light in Air $\times$

Multiple Choice

The correct value for the speed of light in air is

A) 3 $\times$ 10⁵ km/h.
B) 3 $\times$ 10⁸ m/s.
C) 3.0 $\times$ 10⁵ m/s.
D) 1.86 $\times$ 10⁵ miles/h.
E) 1.86 $\times$ 10⁵ feet/s.