Which of the following must happen for an amendment to be added to the U. S. Constitution? (A) The amendment must be ordered by the president and then passed by both houses of Congress.

(B) The amendment must be passed by both houses of Congress and three-fourths of the state legislatures.

(C) The amendment must be declared constitutional by the members of the Supreme Court.

(D) The amendment must be passed by both houses of Congress and a majority of the nation's eligible voters.