Large Interest Groups Are Often Difficult to Organize Because

Large interest groups are often difficult to organize because

A) many of their potential members prefer to let someone else shoulder the interest groups' financial burden.
B) as they grow in size, they attract more unfavorable publicity.
C) they usually suffer from diseconomies of scale.
D) the Internet has not made it easier to convince individuals to join.
E) they often do not represent compelling interests.