1: This is the largest landform in Canada.

A: Interior Plaines
B: Canadian Shield
C: Canadian Cordillera
D: Arctic Archipelago

https://www.reference.com/geography/canada-s-largest-landform-region-734a8aae88f0b630

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To determine the correct answer, we need to understand the characteristics of each landform and compare them to the given options.

The Interior Plains (option A) are a vast region characterized by flat or gently rolling landscapes extending from the Canadian Shield to the Rocky Mountains. While they cover a significant portion of Canada, they are not the largest landform in the country.

The Canadian Shield (option B) is a massive geological shield that occupies a substantial part of eastern and central Canada. It is composed of ancient, hard rocks and is known for its rock formations, numerous lakes, and boreal forests. The Canadian Shield is indeed quite large, but it is not necessarily the largest landform in Canada.

The Canadian Cordillera (option C) refers to the Western Cordillera in Canada, which includes the Rocky Mountains and other mountain ranges along the western coast. This region is characterized by rugged mountains, deep valleys, and high plateaus. While it is a significant landform, it is not the largest in terms of total area.

The Arctic Archipelago (option D) is made up of a large group of islands in the Arctic Ocean, including the Canadian Arctic Islands. This area is known for its icy landscapes, vast glaciers, and unique wildlife. In terms of landmass, the Arctic Archipelago is the largest landform among the given options.

Therefore, the correct answer is D: Arctic Archipelago.