Putnam Worried That Americans Might Be Losing Social Capital Because

 Putnam worried that Americans might be losing social capital because 

A)  they are increasingly likely to complain about government. 
B)  they are less likely to participate in major elections. 
C)  they have high levels of external political efficacy. 
D)  they are less and less likely to join voluntary associations. 
E)  they are a nation of "joiners."