Which of the following most accurately explains the greenhouse effect?

A. Long light waves enter the atmosphere and become trapped.

B. Short light waves enter the atmosphere, are reflected, and the waves get longer. These long waves are trapped by the atmosphere.

C. Long light waves enter the atmosphere, are reflected by the earth's surface, and waves shorten. These short waves are trapped by the atmosphere.

D. Incoming solar radiation is trapped in the upper atmosphere and then heats the layers below