The Central Plains Region Is Susceptible to Tornadoes Because ____

The Central Plains region is susceptible to tornadoes because ____.

A) cool, dry surface air is overlain by warmer, more humid air aloft
B) warm, humid surface air is overlain by cooler, drier air aloft
C) cool, wet surface air is overlain by warmer, drier air aloft
D) warm, dry surface air is overlain by cooler, wetter air aloft
E) warm, humid surface air is overlain by even warmer, and more humid air aloft