Help for OG7 (C)

The ice on the front windshield of the car had formed when moisture condensed during the night. The ice melted quickly after the car was warmed up the next morning because the defrosting vent, which blows only on the front windshield, was turned on full force.

which of the following, if true, most seriously jeopardizes the validity of the explanation for the speed with which the ice melted?

(A) The side windows had no ice condensation on them.

(B) Even though no attempt was made to defrost the back window, the ice there melted at the same reate as did the ice on the front windshild.

(C) The speed at which ice on a window melts increases as the temperature of the air blown on the window increases.

(D) The warm air from the defrosting vent for the front windshield cools rapidly as it dissipates throughout the rest of the car.

(E) The defrosting vent operates efficiently even when the heater, which blows warm air toward the feet or faces of the driver and passengers, is on

I am confused with the explanation of the ETS, which says that "Choice C might support the explanation, since the air from the defrosting vent was warm."  In C, there is no indicate that "the air from the defrosting vent" .

I think "the air" just "the air", not "the air from the defrosting vent"

Please help. Thanks

提干的主要推理：

因为除霜开到最大，所以融化速度快

附加信息：除霜口对着前窗

A侧窗未结霜：无关

D除霜机的热气冷得快：无关

E除霜机在开heater时也effective：无关

ADE：排除

B后窗的融化速度和前窗一样快

C风的温度越高霜化得越快

这里容易受附加信息的影响，但是应该注意的是，什么是主要逻辑？

主要逻辑强调：除霜速度受风力大小影响

C说速度还受风的温度影响，打击了主要逻辑，是较好的答案

当然B会使我们对推理产生一定疑问，但它没有直接打击主要逻辑，故没有c好

楼上的理解好象有点不对

我觉得原文说因为the defrosting vent开大----所以车子waim up以后兵融的快,求削弱

 ade无关,b说没有被dofrost的后窗和前窗(被defrost的)融化一样快,这是一种非因果关系的削弱(是答案)

而c说当被吹(到玻璃上的)风的温度升高,兵的融化速度快 (这是支持,)因为原文的因为和所以之间有个假设---defrosting vent blows the warm air which makes the ice melt quickly 而c就是在支持这个假设

个人看法,待高人指点