Question

As steel replaced iron, people also began looking for new fuels. Which of the following fuels became popular in the late nineteenth century? A. wood B. petroleum C. <------ ? coal D. <------ ? nuclear energy

Answer 1

Wood and coal had been used for centuries. Nuclear energy would not be available for humsn use for another 65 years. Petroleum (oil) was just starting to hit it big at that time.