Which of the Following Best Explains Why Special Interest Groups

Which of the following best explains why special interest groups maintain so much power in the U.S. political process?

A) Special interest groups typically represent the largest U.S. companies, and hence get a lot of media attention.
B) Special interest groups stand to gain millions if particular laws are passed and lobby very hard for them; whereas voters stand to lose only a little and don't find opposing them worth their effort.
C) Both special interest groups as well as voters lobby politicians hard regarding certain legislation, however special interest groups typically win out because they have more money.
D) Special interest groups have been powerful in the past because of their ties to wealth; however, their power has been dwindling in recent years.