Which of the Following Is True of Employment in Lobbying

Which of the following is true of employment in lobbying firms by members of Congress?

A) It is very rare for a member of Congress to become a lobbyist because of the negative stigma involved.
B) Most members of Congress join lobbying firms immediately after leaving Congress.
C) They are prohibited by law from lobbying Congress for a set period of time after leaving office.
D) Members of Congress are prohibited by law from joining the lobbying profession.
E) Many members of Congress were lobbyists prior to becoming elected representatives.