which air mass is likely to form over Victoria Island in northern Canada and over Greenland in January and what would its characteristics be

Continental polar air mass.

Explanation:

The northern parts of Canada are those areas that lie in the arctic circle and covers about 40% of Canada's land area. A total area of 3,535,263 km sq. The air is dry and cold throughout the region.  In summer months the temperature is about 7.2 degrees. The continental polar air mass moves don from the polar regions and influences the temperatures of northern America.