Which of the following is considered a good source region for a continental air mass?

Question

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The Canadian Prairies are considered a good source region for a continental air mass as they are a large and relatively flat region with little moisture sources (such as bodies of water), resulting in dry and cold air masses. British Columbia has more moisture sources with its proximity to the Pacific Ocean, and Lake Huron and the Gulf of St. Lawrence are located in more maritime regions with warmer and moister air masses.

Which of the Following Is Considered a Good Source Region