Many Strong Social Movements in the United States (For Example,the

 Many strong social movements in the United States (for example,the antiwar movement of the late 1960s) never produced a significant third party.One reason is that 

A)  most states have laws against the formation of third parties. 
B)  dissident elements of major parties were able to influence elections through party primaries and national conventions. 
C)  the size of these social movements was never large enough to encourage the formation of parties. 
D)  formation of a third party would undermine the goals of these movements. 
E)  such movements typically failed to generate significant interest in mainstream politics.