The OSHA administration (that stands for Occupational Safety and Health Administration) made a graph that shows that since it was formed the number of people who die in accidents at work has kept going down.  How did the economist Dan Mitchell find out if OSHA deserved the credit?

He interviewed OSHA employees and asked them if that were true.
He interviewed employees of different companies and asked them if it were true.
He graphed the workplace fatalities before OSHA was formed.
He graphed the workplace fatalities after OSHA was formed.

How can a wealthy economy make us safer?

It can give us more money to buy safer equipment.
It can give us money to use machines to do the dangerous work that people used to do.
It can give us money to buy equipment to make our drinking water cleaner.
It can give us money to buy equipment to reduce pollution of the air.

John D. Rockefeller was called a Robber Baron.  Who did he rob?

He hired thieves to steal money from his competitors
The people who worked for him did so voluntarily because they got more money doing that than if they didn't so they weren't robbed
He made oil and gas cheaper for everyone which is the opposite of robbery.
He robbed the ranchers of their land and drilled oil wells.

Cornelius Vanderbilt was called a Robber Baron.  Did he rob anyone?

His competitors paid him not to compete with them so that was robbery.
The people who worked for him did so voluntarily because they got more money doing that than if they didn't so they weren't robbed
He made transportation cheaper for everyone which is the opposite of robbery.
He forced people out of their land to build train tracks without paying for the land and that was robbery.
He had Grand Central Depot built which created many jobs at a time when jobs were hard to get which is the opposite of robbery.