I think it's C, though I'm not too sure.
The Kansas-Nebrask Act was an 1854 bill that mandated “popular sovereignty”–allowing settlers of a territory to decide whether slavery would be allowed within a new state's borders. ... Kansas was admitted as a free state in January 1861 only weeks after eight Southern states seceded from the union.Oct 29, 2009
The political parties affected voter turnout when they were stronger because voter turnout was very high.
D) Accessed by a fingerprint, I am choosing D for this one because everything in 2020 is more high tech, and I have already read a story that expresses the feelings about 2020 and how everything is going to work.
Hope this helped!