According to the Text, the Rise in the Number of Interest

According to the text, the rise in the number of interest groups can be attributed to all of the following except

A) institutional changes in Congress, making interest group participation more accessible.
B) success of social movements in developing expertise on special issues.
C) social movements shifting from protest activity to lobbying.
D) the increased influence of "iron triangle" formations in the post-1960s era.
E) civil rights, women's rights, consumer rights, and environmental groups developing more permanent organizational structures.