All of the above are correct. I'll explain:
Work became more dangerous in the 1800's. This was a result of the increase in industrialization, it caused machines to be more powerful, and easier to cause harm. Also, workers in the late 1800´s had a very low standard of living, consequence of their low wages. So this caused 4 things:
- Low skilled jobs often didn't result in better wages or better and safer working conditions, so they attempted to try to get into a skilled trade.
- They often demanded higher wages because jobs often came with very low wages for workers.
- Workers began to join forces to gain enough power to impose better wages and working conditions. They joined forces with other employees creating 'working unions'.
- Sometimes they just tried to find a better job when none of the other options were available, or didn't work at all.
I hope this helps understand why all of the options are correct. Working in the 1800's was a risky business!
Have a great week!