Dense snow cover can cause unusually harsh weather patterns to persist. If a severe winter storm blankets the Great Plains, the snow cover reflects the sun’s radiation back into space and thus keeps the temperature of the ground tow. Consequently, cold air moving down from Canada remains cold enough to cause more snowstorms.
Which of the following is a conclusion that can be properly drawn from the information above

A．Winter weather on the Great Plains is the product of unusual movements of air masses.

B．The Great Plains are more likely than other areas to suffer unusually harsh weather patterns.

C．If the Great Plains get more snow than usual early in the winter and the snow remains until the spring thaw, the winter is likely to be colder than usual.

D．Even if the temperatures on the Great Plains are not extremely cold but are just below freezing, a moderate snowstorm will probably turn into a blizzard.

E．(E) The temperature of the ground depends primarily on the thickness of the snow cover.

下面四幅锋面示意图中，A、B、C、D四地大致处于同一纬度，此时气温最低的地点是（不考虑地形和海陆因素）