The correct answers are: use of central air-conditioning systems, sanitations standards and fire alarms and sprinkler systems.
In 1911, in New York City, there was a terrible fire in a factory which led to some reforms regarding workers' safety and health. A special commission was appointed to conduct an investigation into working conditions in a wide range of industries.
After thorough investigation, the commission submitted 17 bills, and 13 of them became law. All measures regarded factory safety and health laws, and among the measures there were "better fire safety efforts, more adequate air-conditioning system and factory ventilation, improved sanitation and others."
