Which change characterized one difference between the first and the second Industrial Revolutions?
****=What I believe is the correct answer.

Electricity replaced steam power in homes and businesses.****


Machines began to take the place of workers.


Steel production made it faster and easier to lay railroads.


Farm enclosures made more people available to work in industry.

Please, help me out on this, and if I'm wrong, then please tell me which one is correct.