prep 逻辑 请教

gmatziyu

An unusually severe winter occurred in Europe after the continent was blanketed by a blue haze resulting from the eruption of the Laki Volcano in the European republic of Iceland in the summer of 1984.Thus, it is evident that major eruptions cause the atmosphere to become cooler than it would be otherwise.



Which of the following statements, if true, most seriously weakens the argument above?



(A) The cooling effect triggered by volcanic eruptions in 1985 was counteracted by an unusual warming of Pacific waters.

(B) There is a strong statistical link between volcanic eruptions and the severity of the rainy season in India.

(C) A few months after El Chichn's large eruption in April 1982, air temperatures throughout the region remained higher than expected, given the long-term weather trends.

(D) The climatic effects of major volcanic eruptions can temporarily mask the general warming trend resulting from an excess of carbon dioxide in the atmosphere.

(E) Three months after an early springtime eruption in South America during the late 19th century, sea surface temperatures near the coast began to fall.

请问这题为什么是C而不是D呢？
感觉c是无关选项。。谢谢

虎宝

这道题要削弱的主题是：异常寒冷的空气不是eruption造成的。
C正好讲了一个相反的事实来削弱：1982年eruption造成气温高于预期。
D是在支持原文：eruption可以暂时变暖的趋势。