Prevailing winds are the surface winds that blow from a specific direction. The prevailing westerlies move much of the weather across America and Canada. Thus, option A is correct.
What are prevailing westerlies?
Prevailing westerlies are the type of prevailing winds that are also called anti-trades. These winds blow from the west towards the east and lie between 30 and 60° latitude.
The prevailing westerlies affect the climate and the weather of the US and Canada as it brings colder air during the summers and warmer during the winters.
Therefore, the prevailing westerlies determine the weather of the US and Canada.
Learn more about prevailing westerlies here:
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