On a construction site, who is primarily responsible for keeping the work area free of debris, scrap material, and tripping hazards?

Explanation

Section 1513 puts housekeeping on the employer: during construction, alteration or repair, form and scrap lumber with protruding nails and all other debris must be kept reasonably cleared from work areas, passageways and stairs; storage areas and walkways must be kept free of dangerous depressions, obstructions and debris; and combustible debris must be removed promptly. The duty follows the employment relationship, which is what (b) and (d) miss - a general contractor's coordinating role and an owner's contract terms may add obligations and take none away. Option (c) is the everyday practice on site and is not the rule: a worker can be told to clean up after himself, and the employer still owes the condition of the passageway when a different trade leaves it blocked.