|Question 11Verbal

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It is common for freshwater lakes near or above a latitude of 45° north of the equator, like Lake Stechlin in Germany, to accumulate surface ice in winter. A study from 1980 to 2006 showed that, in general, the number of days per winter that such lakes have measurable amounts of surface ice is declining. However, a researcher claimed that some lakes have instead seen an increase in the duration of ice, citing as an example       
Which choice most effectively uses data from the graph to complete the researcher's example?
both Lake Baikal and Oulujärvi, which had more than 100 days of ice in the winter of 2005-06.
A
Lake Baikal, which had more days of ice in the winter of 2005-06 than it did in the winter of 1980-81.
B
both Lake Baikal and Oulujärvi, which had fewer than 195 days of ice in the winter of 1980-81.
C
both Lake Kegonsa and Oulujärvi, which had more days of ice in the winter of 2005-06 than they did in the winter of 1980-81.
D