B. Putting interests of a particular section or region above those of the nation…this refers to the growing cultural and economic differences between the North and South in the years leading up to the Civil War.
Explanation:
The most divisive issue was slavery, free states versus slavery states, abolitionists of the North against the pro-slavery establishment in the South. The two parts of the USA had different economic systems, with the South being agrarian and the North being industrial. There were major divergent commercial and business interests, too.
