
It is common for freshwater lakes near or above a latitude of 45°
north of the equator, like Bosten Lake in China, to accumulate
surface ice in winter. The amount and duration of ice depends on
many factors, including local weather conditions as well as the lake's
depth, volume, and surface area, but a climate researcher claims
that some lakes in these latitudes have seen a decline in the duration
of ice between the early 1980s and the mid-2000s.
Which choice best describes data in the table that support the
researcher's claim?