The correct answer is C) Supported increased power for the states.
The Kansas Nebraska Act was a law passed by the US Congress that allowed citizens of Kansas and Nebraska to vote on whether or not they wanted the institution of slavery. This concept of letting citizens decide on the issue is known as popular sovereignty. This is often viewed as a huge failure, as this law resulted in "Bleeding Kansas." This time period saw consistent violence between people in favor of slavery in Kansas and people against slavery in Kansas.