The Principal Difference Between a Mass Association and a Peak

The principal difference between a mass association and a peak association is:

A) how much influence each has over policy making
B) the number of former government employees that each is willing to employ
C) the level of centralization in the organizational structure
D) membership: a mass association's members are individuals and a peak association includes businesses and other organizations
E) that peak associations are significantly less influential and effective in the political arena than mass associations