B.) It demonstrated that Northern and Southern states could not work together.
Explanation:
During the Missouri Compromise, the government decided that Missouri would be a slave state and Maine a free one, and that the area that is now Kansas and Nebraska would be free. This resulted in heated arguments and even fights between the Northerners and the Southerners, which showed they could not work together to compromise.
NINBY stands for “Not in my back yard” and it represents a negative attitude of the people who opposed zoning and building developments for selfish reasons.