Although Nationalism Started Out with Generally Positive Goals, It Later

Although nationalism started out with generally positive goals, it later degenerated into a zero-sum game concept.What was the conviction that grew out of the latter concept of nationalism?

A) The idea of cultural superiority over other nations.
B) The belief that only agrarian societies could be virtuous.
C) The belief that labor reform would heal society's ills.
D) The idea that the industrial revolution was only for European countries.
E) Unification of small principalities into larger countries was dangerous.