What Rules Govern the Use of Referenda at the Federal

Multiple Choice

What rules govern the use of referenda at the federal level?

A) They can only be used to propose constitutional amendments.
B) They require a two-thirds vote of all Americans.
C) They must be approved by a two-thirds vote of Congress.
D) They can only be used for a declaration of war.
E) No provisions exist for the use of referenda at the federal level.