The Tropopause Occurs at a ________ Elevation Above the Tropics

The tropopause occurs at a ________ elevation above the tropics than above the poles because ________.

A) lower the stratosphere is thicker over the tropics and so it compresses the troposphere
B) lower the troposphere weighs more in the tropics and so it sinks
C) higher the troposphere is hotter in the tropics,and this causes the air to rise to greater heights
D) higher the stratosphere is thinner over the tropics and this allows the troposphere to expand
E) lower heating of the thermosphere forces it downward compressing all layers below.