Light with an Average Intensity Of $683 \mathrm {~W} / \mathrm { m } ^ { 2 }$

Light with an average intensity of $683 \mathrm {~W} / \mathrm { m } ^ { 2 }$ falls on a black surface and is completely absorbed. What is the radiation pressure that the light exerts on this surface if it strikes perpendicular to the surface? $\left( c = 3.00 \times 10 ^ { 8 } \mathrm {~m} / \mathrm { s } \right)$

A) $205,000 \mathrm {~N} / \mathrm { m } ^ { 2 }$
B) $4550 \mathrm { nN } / \mathrm { m } ^ { 2 }$
C) $1140 \mathrm { nN } / \mathrm { m } ^ { 2 }$
D) $2280 \mathrm { nN } / \mathrm { m } ^ { 2 }$