Why was South Carolina wanting a republican to win the election of 1860?

In 1832, led by Calhoun, South Carolina approved an Ordinance of Nullification, which was intended to serve notice on the United States government that South Carolina would not tolerate a high tariff. ... South Carolina's secession was the first in a series to occur before Abraham Lincoln's inauguration in March 1861. The Republican Party was relatively new; 1860 was only the second time the party had a candidate in the presidential race. The Constitutional Union Party was also new; 1860 was the first and only time the party ran a candidate for president. The results of the 1860 election pushed the nation into war. The declaration stated the primary reasoning behind South Carolina's declaring of secession from the U.S., which was described as "increasing hostility on the part of the non-slaveholding States to the Institution of Slavery". How did South Carolina respond to the election of Abraham Lincoln as president in 1860? It called for a state convention and demanded a recount. ... It called a state convention and voted to secede from the Union. It called a state convention and voted to secede from the Union.

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i believe the answer is c