Which of the following types of air masses is the coldest of all?

Name: Which of the following types of air masses is the coldest of all?
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The cA type of air mass is the coldest of all. It originates over the high-latitude landmasses of Siberia and Canada, where the extremely low temperatures cause the air to become extremely cold and dry. As this air mass moves southward, it can bring bitterly cold temperatures to much of North America.

Which of the Following Types of Air Masses Is the Coldest