Which of the Following Is One of the Major Differences

Which of the following is one of the major differences between political parties and interest groups?

A) Contributions to interest groups are tax deductible, whereas contributions to parties are not.
B) Federal law makes it illegal for an interest group to entangle itself with politics and elections, while these activities are legal in the case of political parties.
C) Interest groups do not run candidates for office as do parties, though interest groups will endorse candidates.
D) Political parties are government agencies whereas interest groups are private entities.
E) Interest groups have very little influence in the development of legislation in Congress, whereas this is not the case for political parties.