Answer: d. They supported groups that threatened, intimidated and even killed blacks who challenged the social and economic order.
Step-by-step explanation:
After the Reconstruction period and Federal troops withdrew from occupying the Southern states, White Democrats went about engaging in actions that would reduce Blacks to a status slightly higher than the one the had during slavery.
They supported groups like the KKK which threatened, intimidated and even murdered Blacks so that they could make the Black population submit and adhere to the Southern social and economic order that put Whites on top and Blacks beneath.