The Tropopause Occurs at A__________ Elevation Above the Tropics Than

The tropopause occurs at a__________ elevation above the tropics than above the poles because__________ .

A) higher; the stratosphere is thinner over the tropics and this allows the troposphere to expand
B) lower; the troposphere weighs more in the tropics and so it sinks
C) lower; the stratosphere is thicker over the tropics and so it compresses the troposphere
D) higher; the troposphere is hotter in the tropics,and this causes the air to rise to greater heights