The Intensity of Radiation Reaching the Earth from the Sun

The intensity of radiation reaching the earth from the sun is 1 350 W/m².The earth's radius is 6.4 * 10⁶ m.How big a force does this radiation exert on the earth? (Assume it is all absorbed. )

A) 5.8 * 10⁸ N
B) 1.2 * 10⁹ N
C) 2.3 * 10⁹ N
D) 4.6 *10⁹ N
E) 1.7 *10¹⁷ N