Final answer:
It takes a two-thirds majority of both the House of Representatives and the Senate to amend the Constitution.
Step-by-step explanation:
The answer to your question is B) 2/3. It takes a two-thirds majority of both the House of Representatives and the Senate to amend the Constitution. This is known as a supermajority. Once an amendment is approved by a two-thirds vote in Congress, it is then sent to the states for ratification. Ratification requires the approval of three-fourths of the state legislatures.