Answer:
Proposal and Ratification
Step-by-step explanation:
Proposal
2/3 votes of each house of Congress
OR
national convention called by Congress at request of the state legislatures
Either one of these 2 proposal ways could lead to (these 2 ratification methods):
Ratification
3/4 of state legislatures vote for it
OR
3/4 of state convention vote for it
Hope this helps