The answer is contained in the last line of the question.
Here is the explanation:
Latitude is an angle measured north or south from
the equator. The greatest
possible latitude is 90 degrees ... 90°N at
the north pole, 90°S at the south
pole, and you can't get any farther from the equator than the poles. So from
the latitudes on this list, 90°N and 90°S are the ones where glaciers are most
likely.
