Who proposed the idea of nullification?

The best known statement of the theory of nullification during this period was said by John C. Calhoun

Explanation:

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Calhoun

Calhoun developed the idea of nullification—first put forth in the Virginia and Kentucky Resolutions of 1798—as a strategy for the South to preserve slavery in the face of a Northern majority in Congress.

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the name of the theory is landmass theory.

the answer is a) high entry costs