Some employers, labor unions, and can workers receive fair pay and safe work environments.
natural resources
consumers
the government

I wouldn't say it's the natural resources: they might help economic growth, but not worker's rights.

Also consumers rarely care about the worker's rights (although this is changing lately)- they choose their products according to the prize and quality.

The correct answer is: The government. Governments often make laws to protect the workers.

It’s actually still in the u.s.