What Has Been One of the Most Pressing Questions Concerning

What has been one of the most pressing questions concerning socioeconomic status?

A) Why has the level of participation in politics not increased as a result of the rising level of education among Americans?
B) Why do recent immigrants display a higher level of political participation than second- and third-generation Americans?
C) Why is Catholic American participation consistently higher than that of Protestant Americans?
D) Why do citizens in coastal cities tend to have a voting rate approximately 5-7 percent higher than citizens in landlocked states?
E) Why have rising income levels not increased the number of people who are willing to make monetary contributions to political candidates?