The Intensity of Solar Radiation on Earth Is About 1

The intensity of solar radiation on Earth is about 1.4 × 10³ W/m². How many 50-W lightbulbs would you have to arrange in an array 3 m from you in order to obtain the same intensity as the Sun?

A) 8.0 × 10²
B) 5.3 × 10²
C) 3.2 × 10³
D) 1.0 × 10⁷
E) 1.6 × 10³