If by planters you mean "Plantation owners", then it is planters. Plantation owners were at the top of the South's social hierarchy because they possessed large plots of land, yielding much income from the that land, and with the income came political power.
People were encouraged to explore and settle in new lands because C isnt true , A and B are the same and they didnt develop new products to fight diseases nor did they carefully trade.
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WELL YOU SEE I JUST BROKE OUT OF THE BROWARD COUNTY JAIL SO IM HERE TO HELP IM R KELLY JEST TO LET YOU KNOW