What did most rich southern planters do with their wealth?

a. they bought luxury items that showed others they were
successful.

b. they bought shares of ownership in railroads and canals.

c. they bought shares of ownership in factories.

d. they put it back into their plantations and bought slaves.

I think it’s D

Explanation: By the start of the war, the South was producing 75 percent of the world's cotton and creating more millionaires per capita in the Mississippi River valley than anywhere in the nation. Slaves represented Southern planters' most significant investment—and the bulk of their wealth.

They put it back into their plantations and bought slaves. (Apex)

Explanation: