Per Unit Area (Such as a Square Centimeter),a B Star

Multiple Choice

Per unit area (such as a square centimeter) ,a B star whose surface temperature is 10,000 K will put out how much radiation compared to an O star whose surface temperature is 30,000 K?

A) 81 times as much
B) 9 times as much
C) 1/81 as much
D) 1/9 as much
E) 1/3 as much