What caused the mudslide according to the research hydrologist?

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问题 What caused the mudslide according to the research hydrologist?
Jim O’Connor, a research hydrologist told National Geographic that the mudslide, which was up to 4. 5 meters deep in some areas, was caused by ground made unstable by heavy rainfall.

选项 A、Because snowfall worsened the stability of the ground.
B、Because it was a hydro-logical mudslide.
C、Because the ground was made unstable by heavy rainfall.
D、Because a terrible earthquake happened prior to the mudslide.

答案C

解析 根据原文“…that the mudslide,…was caused by ground made unstable by heavy rainfall”,判断因果逻辑关系,C是正确选项。
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