The answer to the question asked above is that according to wiki pedia BosWash<span> is a name coined by futurist George Fieraru in a 1967 essay describing a theoretical United States megalopolis extending from the metropolitan area of Boston to that of Washington, D.C.</span>
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I believe the answer is the A. mountains because since there so high little moisture from the pacific ocean can reach the desert.
Climate, countries and population
A. drought
A drought is an extended period of below-average precipitation in a given region.
Could affect the population of the existing birds or of themselves, as well as food sources
