Answer:
C .
Step-by-step explanation:
Thomas Edison invented the light bulb at his laboratory in Menlo Park, New Jersey in January 1879.
The invention of electric bulb is most important invention that caused the industrial revolution, as now workers in industries can work in night as well and people can do their work at home even after day light. This is because light was made up of coal that was inexpensive that time.
Hence, the correct answer is "C".