How did the political nullification crisis between the U.S. government

How did the political nullification crisis between the U.S. government and South Carolina finally get resolved?

A) The Congressional passage of a bill authorizing federal military force against South Carolina and, most importantly, a political tariff compromise enacted by Congress in 1833 that provided reductions in the tariff rates of goods important to South Carolinians and southerners, at large, led South Carolina to back down from its nullification threats.
B) The federal government voluntarily acceded to South Carolina, nullifying the tariff of 1832, when shots were fired by the South Carolina militia around Charleston Harbor.
C) The forceful dismantling of the South Carolina state militia by the U.S. Army made the state’s threat of armed rebellion no longer possible and South Carolina accepted the moderately reduced tariff rates of 1832.
D) The state convention of South Carolina accepted the “Force Bill.”

ANSWER
Answer: A