d. no subarctic regions exist in the southern hemisphere.
Explanation:
Both the Canada in the Siberia is found in the subarctic zones of the northern hemisphere thus they belong to the northern part of the earth and have polar high-pressure belt and create a polar cell, as compared to that of the southern hemisphere which has a polar high with Antarctica and the Australian plates dominating these regions.
Thus there is no subarctic region that can be found in the southern hemisphere and nor region is big enough to reach the south pole by displacement of the oceanic mass.
The word supports has no content in terms of the landscape only surrounds, includes and consists of is taken into consideration.
