Answer:
I'm not really good at this but I think that it is either 4 or 3 but my better guess is 3..
I THINK it is answer choice A. Marbury V. Madison was about judicial review. Gideon V. Wainwright was about providing an attorney for the defendant who were unable to afford their own attorney. And please he versus Ferguson was about the separate but equal doctrine. So answer choice A is the only one that makes sense.
D stock owners most likely
The last Tsar was Nicholas II.
Kansas-Nebraska Act received the strongest Southern support.