Radio Waves Travel at the Speed of Light, Which Is

Radio waves travel at the speed of light, which is 3.00 × 10⁸ m/s. How many kilometers will a radio message to outer space travel in exactly one year? (365.24 days = 1 y)

A) 9.46 × 10¹⁵ km
B) 7.30 × 10⁸ km
C) 7.10 × 10¹⁰ km
D) 9.47 × 10¹² km
E) 3.33 × 10^{- 3} km