Which of the following regions is labeled with the number 4 on the map above?
a.
the arctic
b.
the lowlands
c.
the interior plains
d.
the canadian shield

Option B. The lowlands is the region that labeled with the number 4 on the map presented in the question.

Explanation:

The Hudson Bay-Arctic Lowlands is a land-form region of Canada, located through the provinces of Ontario, Quebec, Manitoba, Yukon, Northwest Territories and Nunavut. The region was formed in the Paleozoic Era, when the weight of a glacier sunk the Canadian Shield and the area became a lowland due to the glaciers retreating.