Which of the following the north industrialize?
a. more workers
b. better farmland
c. less capital
d. fewer rivers

The correct answer here is the option A.

Among numerous things it was the existence of more workers that actually helped the North industrialize as fast as it did. The North also had more people than the South and which meant a larger work force. The industrialization itself than attracted even more people to the North which just added to already large work force.

The one thing that helped the North to industrialize was actually more workers. The more workers they had the better. They could finish contracts on time, etc. The correct answer is A.