Which development most contributed to the start of the second industrial revolution in the late 1800s?
a; the development of new agricultural schools
b; the collapse of the railroad industry
c; the availability of inexpensive steel
d; the invention of water powered machines

c; the availability of inexpensive steel

Explanation:

The Second Industrial Revolution started in the middle of the 19th century. During that moment, electricity and electric light were introduced into mechanization and this made the steel production rise.

Mass production was developed, the scale and speed of production of steel increased, this pushed the railroad development, the production of machine tools, the construction of buildings and automobiles.