What is the main idea of this document is? We know this from the text because?? The author created this source to?? The author have/ does not have a reason to distort the information?? Please help me ASAP I will give you more points. Help!!

Which best describes the purpose of the south carolina exposition and protest, which was written by john c. calhoun? a) to explain why the south was nullifying the tariff of 1828 b) to describe the ways the tariff of 1828 would southerners c) to persuade northern states to rebel against the federal government d) to ask england for if the south decided to secede from the union