When are employers required to provide gfcis on construction sites?

The correct answer to this open question is the following.

Employers required to provide GFCIs on construction sites to all the workers to prevent accidents due to the high voltage wires that could be in the construction site on wet grounds. According to the Occupational Safety and Health Act (OSHA), all construction workers must have a GFCI fast-acting circuit breaker to sense imbalances in the circuits of the construction site.

it should be c, women were allowed to vote in all states because federal law supersedes state law.

"states can make their own laws, as long as they don't contradict what the federal law states. the states do not have the authority to pass a law that negates a federal law." -google