Which of the Following Is True of Interest Group Representatives

Which of the following is true of interest group representatives or lobbyists?

A) Their movement between their groups' headquarters and congressional offices is restricted.
B) They are frequently asked to testify before congressional committees on the effect or potential effect of particular legislation.
C) They are seldom consulted when Congress formulates new regulations.
D) Since interest groups are a temporary feature of American government, lobbying has not yet developed into a profession.
E) A professional lobbyist can represent only a single interest group throughout his or her career.