The Second Industrial Revolution Differed from Earlier Industrialization in

The Second Industrial Revolution differed from earlier industrialization in

A) making use of electricity as a major source of energy.
B) manufacturing iron rather than steel.
C) the use of the more efficient steam engine rather than unpredictable electricity.
D) following the philosophy of Karl Marx in organizing the economy.
E) being restricted to the United States and Russia instead of the nations of Western Europe.