What factors made it especially
difficult to farm in the northern
plateau of Mesopotamia?

C. rocky, infertile soil.

Explanation:

although mesopotamia had fertile soil, farming wasn't easy there. the region received little rain. this meant that the water levels in the tigris and euphrates rivers depended on how much rain fell in eastern asia minor where the two rivers began.

i think that the answer is polishing peanuts

b) the confederacy had to pay all union war expenses.