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题目材料：

Glaciologists have conjectured that increasing temperatures and decreasing precipitation caused the rapid observed retreat of glaciers throughout the European Alps after the mid-nineteenth century. However, such scenarios are inconsistent with temperature records and climate proxies. During the latter half of the nineteenth century through the early twentieth century, when glaciers were retreating rapidly, temperatures in the Alpine region were apparently cooler than in the late eighteenth to early nineteenth centuries, and precipitation was largely unchanged. Glaciers subject to these climatic conditions alone should have advanced instead of retreated. One possible explanation is the dramatic rise of industrial black carbon in the mid-nineteenth century. Black carbon deposits could have increased the absorption of solar radiation by snow, generally increasing glacier melt and resulting in glacier retreat.

The author's critique of what "Glaciologists have conjectured" assumes that

Aglacier retreat occurred synchronously throughout the European Alps during the latter half of the nineteenth century
Bthe cause of glacial retreat in the mid-nineteenth century will never be definitively established
Crecords of temperatures and precipitation during the latter half of the nineteenth century are reasonably accurate
Drates of precipitation in the nineteenth and twentieth centuries varied greatly across the European Alps
Eindustrial pollution was the primary cause of warming climatic conditions in the late nineteenth century

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