The Income Gaps Between the Highest Earners and the Lowest

The income gaps between the highest earners and the lowest earners in the United States have:

A) narrowed substantially during the past five decades due to globalization and its increased economic opportunities.
B) increased substantially during the past five decades due to changes in the tax code and stagnating salaries.
C) remained the same during the past five decades, as all classes take advantage of the increased economic opportunities arising from globalization.
D) remained the same during the past five decades due to economic stagnation.
E) increased substantially in the past five decades as the economy implodes.