Answer:
c. States' rights.
Explanation:
The Confederacy was born because many states were unhappy with the Union government wanting to “remove states rights”. Because of that, they seceded and formed the Confederacy with a Constitution that gave more liberty and rights to the States.
The problem was that there were great tensions in the Confederate government exactly for that reason. States had so much power and liberty that they wanted to become separate nations, which did not help with the efforts that the Civil War, it demanded administrative and military central powers, which collided with the states rights demands.