The correct option is B Steel and oil refining
In the late 1800s, a second Industrial Revolution was generated by innovations in Steel and oil refining. The 19th century was a period of great change and rapid industrialization. The iron and steel industry spawned new construction materials, the railroads connected the country and the discovery of oil provided a new source of fuel. The discovery of the Spindletop geyser in 1901 drove huge growth in the oil industry.