Answer:
Missionaries I'm pretty sure
Explanation: i remember learning this sorry for a bad explanation.
The correct answer is D. enforce new laws in the South. The problem was that there were still a lot of racially discriminatory laws in the south and a lot of social discrimination which made it difficult to enforce new laws,such as the prohibiton of racial discrimination of voting.
I vaguely remember reading the book. I remember it was in the perspective of a German infantryman. So i believe B would be the best answer. I recommend it, its a good book too.<span />