Question

what was the status of us workplace safety laws in 1900?
a few states had tried to pass safety laws, but they had no public support.
most states had passed some safety laws, but enforcement varied.
most states opposed safety laws, but workers began to demand them.
all states had safety laws, but no one bothered to enforce them.

Explanation:

In 1900, most US states had passed some workplace - safety laws, but the level of enforcement differed from state to state. There was no uniform and strict enforcement mechanism across all states.

Answer:

B. Most states had passed some safety laws, but enforcement varied.