Answer:
D. The implementation of the Tariff of Abominations
Explanation:
The Nullification Crisis was caused by the tariff acts imposed by the federal government. The 1828 Tariff Abominations increased the tariffs up to 50%, thus igniting the nullification crisis. Calhoun believed that the tariff system would bring poverty to the South as the southern states were agricultural in nature.
(Hope this helps!! Btw, I am the first to answer. If my answer is wrong, I apologize..)
