*PLEASE ANSWER, I'M CONFUSED* Which detail is true about John C. Calhoun?

a.) He cast the deciding vote in Congress to pass the Tariff of 1828.

b.) He fought a duel with Henry Clay over the outcome of the election of 1824.

c.) He opposed sending American delegates to the Congress of Panama.

d.) He convinced several states, including Kentucky, to elect John Quincy Adams president.