Wintertime MP Air Masses Are Less Common Along the Atlantic

Multiple Choice

Wintertime mP air masses are less common along the Atlantic coast of North America than along the Pacific coast mainly because the

A) water is colder along the Pacific coast.
B) prevailing winds aloft are westerly.
C) ​source region for mP air on the Atlantic coast is western Europe.
D) ​water is warmer along the Atlantic coast.
E) ​land is colder along the Atlantic coast.