How did thomas edison's invention of the light bulb affect industry? a. electric lights made it possible for factories to run after dark. b. having better lighting largely eliminated industrial accidents. c. bulb manufacturing became the biggest industry in the united states. d. brighter lights made people more productive, so they worked fewer hours.

The correct answer is A.Electric lights made it possible for factories to run after dark.

The conditions were still dreadful and it didn't reduce accidents. It only made it possible for factories to run after dark which made conditions even worse since people started working for over 12 hours a day in order to keep their jobs since they were easily replaceable in the factories because the jobs were mostly low skilled jobs.