Answer:
Option: A. Economic interests
Explanation:
Southern states believed they had the right to self-govern to protect their economic interest. Slavery legally practised in the South as the region was base on plantations. As the North began to interfere in the issue of slavery, the South decided to be vocal about it, and supported the ideas of self-government (Confederate) in several states with new currency and constitution. Southern people believed that each state should be able to determine its laws, regarding rights and slavery.
