Researchers from Harvard and Berkeley Conducted the Largest Study of Inequality

Researchers from Harvard and Berkeley conducted the largest study of inequality in the United States to date. Which of the following did their research reveal?

A) Social mobility is higher in the United States than in other Global North nations.
B) Social mobility is highly variable by region.
C) Family income and wealth has little effect on a child's opportunity for future upward mobility.
D) Social mobility is higher than it's ever been in the United States.