One of the Most Significant Markers of the "Two-Tiered Economy

One of the most significant markers of the "two-tiered economy" of the late twentieth and early twenty-first centuries was

A) the preponderance of the two-income household.
B) economic divisions between the West and the South.
C) the disparities between educated and uneducated workers.
D) the disparities between younger and older workers.
E) the disparities between white and minority workers.