Lets use the process of elimination in your question
It can't be A because Lincoln wanted to end the war and have the Southern states join the union as quickly as possible and free all the slaves
It is most likely B because he doesn't really do much to punish he wants to end the war
C and D could easily be eliminated
I would say the Populist Party.
The answer to your question is B. progressive tax
hope this helped. CX
-bunny
The league of nations might have forced the united states to become an international peacekeeper