Comparing Class Mobility in the U

Comparing class mobility in the U.S. and in other Western countries, the data indicate that

A) class mobility is higher in the United States than in all other Western countries.
B) class mobility is lower in the United States than in all other Western countries.
C) the United States is in the middle regarding class mobility compared to other Western countries.
D) the United States fluctuates between high and low levels of class mobility depending on which party is in power.
E) class mobility cannot be measured.