Why did southerners support the Kansas-Nebraska act

A. they wanted to stop the spread of slavery to that region

B. they wanted to continue the rule established by the missouri compromise

C. they thought they granting popular sovereignty would allow slavery

D. they thought the region should continue to be one territory

The reason why the southerners supported the act was because the two states could vote to be free or slave states, so people from the north and the south rushed there to get those states to be free or slave, this is also known as bleeding Kansas.

So the answer is most likely C, just because this one makes the most sense