Large Interest Groups Are Often Difficult to Organize for Which

Large interest groups are often difficult to organize for which of the following reasons?

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