Region A was the second to industrialize following the industrial revolution. Option C is correct. The United States was the second industrialized country.
Industrialisation is the period of social and economic shift that change a human group from an agrarian society into an industrial society, involving the extensive re-organisation of an economy for the purpose of manufacturing.
The industrial growth that began in the United States in the early 1800's went on steadily up to and through the American Civil War.