The Safety Valve Theory That the West Dampened Class Conflict

The safety valve theory that the West dampened class conflict, while exaggerated, did have some validity because

A) free western land did attract many immigrants to the West who might have crowded urban job markets.
B) western farmers tended to be politically more conservative than those in the East.
C) wealthy western farmers hired many unemployed laborers from eastern cities.
D) eastern city dwellers headed west to get free homesteads during depressions.
E) western cities had less class conflict than those in the East.