The correct answer is C) 9.5 hours.
In 1900, the average workday was 9.5 hours.
The Industrial Revolution brought many advantages but also many disadvantages. Workers had to work for long periods under unhealthy conditions and lack of fresh air. Wages were low and the spaces were crowded. It was the Union's protest and pressure to the US government to change those Inhuman long work hours. It was President Ulysses S Grant who issued an announcement that guaranteed an eight-hour workday in 1889 for government workers. By 1905, an 8-hour workday was common in industries.
It was Henry Ford who announced a five day, 40-hour workweek for his workers in 1926.