1372 Watts Per Square Metre (2 Calories Per Cm² Per

1372 watts per square metre (2 calories per cm² per minute) refers to the

A) solar constant,which is the average value of energy received at the thermopause.
B) solar wind input to the atmosphere.
C) average energy receipt at Earth's surface.
D) amount of energy absorbed by the atmosphere.
E) the amount of energy required to raise the temperature of 1 g of water by 1 celsius degree.