The South feared the North's: O A. Rapid population growth.
O B. City culture.
O C. Cash crop production.
O D. Cotton boycott.

B. City culture

Explanation:

In the 1700s and 1800s, the US North started to become more industrialized and urban.

Especially with the Industrial Revolution, a new city culture started to emerge.

Consumerism and individualism became tied to the growth of factories and modern infrastructure that began to develop.

The South feared this distinct city culture of the North because it intensified sectionalism between the 2 regions.

So, the correct answer is B.