is the amount of goods available at a certain price a. Supply
b. Profit
c. Interest
d. Demand

supply

Explanation:

supply in other meaning means how much you have of something

- three-quarters or two-thirds..

- "the constitution provides that an amendment may be proposed either by the congress with a two-thirds majority vote in both the house of representatives and the senate or by a constitutional convention called for by two-thirds of the state legislatures."

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your answer would be (a)