Please help ill give <33 (no links or ill report) which of speakers below explained a reason the UNION fought the Civil War?

speaker 1 - for my family to keep our land in Georgia after the war, we had to work with the republican government.
speaker 2 - The opportunity to buy prime cotton land for cheap is too good to pass up, i am going to leave New York and move to Georgia to make my fortune.
speaker 3 - The right of the states to have self-determination over their state is essential and worth fighting for.
speaker 4 - The federal government must be the strongest government or their will be chaos.

A ) Speaker 1
B ) Speaker 2
C ) Speaker 3
D ) Speaker 4