What Was the Belief That Permanently Shaped American Political and Social

What was the belief that permanently shaped American political and social ideals between 1870-1900?

A) The belief that organized labor was the future of the country's prosperity.
B) The idea that universal suffrage was the best way to advance economic growth.
C) The belief in a relatively high degree of economic equality and opportunity.
D) The concept that reliance on England was the best way to develop the American economy.
E) The idea to compete by adopting the French and German models of export-led economic growth.