Answer:
A. Democratic Party
Step-by-step explanation:
The Democratic Party was in favor of the Kansas-Nebraska Act of 1854 because it allowed for popular sovereignty in the territories, which meant that the settlers in those territories would be able to vote on whether or not to allow slavery. The Democrats believed in the principle of states' rights and the idea that each state should have the right to decide for itself whether or not to allow slavery. The Act was seen as a way to spread the institution of slavery and give the South more power in the territories.