In general, employers must provide fall protection to construction workers working on surface with unprotected sides and edges that are how many feet above the lower level?

4 feet above lower level

Explanation:

The duty to have fall protection is the most cited standard in the construction industry and is a leading cause of death for construction workers. Employers need to do a better job of assessing workplaces and implementing fall protection systems and equipment to protect workers. In this regard, employers are required to protect workers against risks of falling along unprotected sides or edges at least 4 feet above a lower level.

olivia is the best example for presentating so it would be d.