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.

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i only have part a but here is the first one: - lewis and clark are born

- lewis marries sacajawea and clark is jealous  

- clark drowns lewis and then goes to jail