The Rapid Increase in the Number and Variety of Interest

 The rapid increase in the number and variety of interest groups and their enlarged role in government are 

A)  an unintended consequence of federalism. 
B)  a rational response to the fact that elected officials can tend to only a few things. 
C)  the inevitable result of a two-party system. 
D)  the primary cause of increased voter turnout. 
E)  the primary cause of divided government.