Answer:
C
Explanation:
I know because I know that how

It is a battle fought between the East India Company force headed by Robert Clive and Siraj-Ud-Daulah (Nawab of Bengal). The rampant misuse by EIC officials of trade privileges infuriated Siraj. The continuing misconduct by EIC against Siraj-Ud-Daulah led to the battle of Plassey in 1757
My best choice would be A. The south depended on slavery for economical reasons. The northerners believed slavery was morally wrong. A little after the 1800's Northerners had abolished slavery.