A( takes an act of two-thirds of congress and ratification by three-fourths of the states.
a. civil rights bill
b. amendment
c. clause

An amendment takes an act of two-thirds of Congress and ratification by three-fourths of the states. The changes in the amendment could be proposed either in Congress or states. The proposal must have 2/3 of both houses in congress agreeing to the amendment. Meanwhile, the state must as well have 2/3 of the state legislatures to propose the amendment. Regardless of whoever proposed the amendment, it must be ratified by ¾ of the states.