In which two regions is the population concentrated in coastal communities? Puget Lowlands and Willapa Hills
Olympic Mountains and Puget Lowlands
Willapa Hills and Olympic Mountains
Puget Lowlands and Columbia Basin

Willapa Hills and Olympic mountains

Explanation:

That is correct because those are the only two regions in the state of Washington that are found on the far western side of the state. Also the puget  lowlands are not an option because they are not seaside regions they are just placed among an inlet of water coming from the san juan islands region.

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