I believe the answer is B
a victory at the siege of vicksburg mississippi in 1863
I think you forgot to add the options but based on my research, the correct answer is "The unemployment rate increased in cities." This statement describes an effect of urbanization. Thank you for posting your question. I hope this answer helped you. Let me know if you need more help.
Deal with the wars, religious stuggles, and societal issuses which plague the empire.