how did the glaciers affect the great lakes托福OG,147页上方

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how did the glaciers affect the great lakes
托福OG,147页上方

我想应该是A
解释里也说了“the great lakes used to be a lot BIGGER as the glaciers were retreating”,而且根据“The beach of a former higher stage of...”这一句也可以推断出海岸线缩小了,所以我猜是A

我也觉得是A