To What Aspect of America Were William Watts and Lloyd

To what aspect of America were William Watts and Lloyd Free referring when they labeled it "the country of individualism par excellence"?

A) the majoritarian nature of the voting and election system
B) the ability of any individual to aspire to high political office
C) the judicial nature of American politics,in which any individual can challenge powerful interests
D) the emphasis that Americans place on economic self-reliance and free markets
E) the ability of the individual to join in labor unions and interest groups to pursue his or her political and financial self-interests