Light with an Intensity of 1 KW/m² Falls Normally on a Surface

Multiple Choice

Light with an intensity of 1 kW/m² falls normally on a surface with an area of 1 cm² and is completely reflected.The force of the radiation on the surface is:

A) 3.3 *10^-11 N
B) 1.7 * 10^-10 N
C) 3.3 * 10^-10 N
D) 6.7 *10^-10 N
E) 1.0 * 10^-4 N