Final answer:
OSHA's four housekeeping rules involve maintaining good housekeeping practices, keeping aisles and exits clear, storing materials properly, and promptly cleaning up spills to ensure a safe workplace. Option C is correct.
Step-by-step explanation:
The correct answer to the question What are OSHA's four housekeeping rules? is option c) Maintain good housekeeping practices, keep aisles and exits clear, store materials properly, and clean up spills promptly. These housekeeping rules are part of OSHA's broader requirements for a safe workplace, which include protecting workers from various hazards.
Employers are responsible for maintaining workplaces free of serious recognized hazards by implementing feasible safety measures, providing training and divulging information in understandable languages and forms, and ensuring workers' right to a safe work environment.