One of the main responsibilities employers have under OSHA is to provide a workplace free from serious recognized hazards and comply with standards, rules, and regulations issued under the ________.

Employers are required under the Occupational Safety and Health Act (commonly referred to as the OSH Act) to maintain a workplace that is free from serious recognized hazards. This legislation establishes the framework through which health and safety standards are developed and enforced. The OSH Act mandates that employers comply with its regulations to ensure worker safety and health, which includes adhering to the specific standards, rules, and regulations the Act entails.

This Act empowers the Occupational Safety and Health Administration (OSHA) to set enforceable standards and conduct inspections to promote safe working conditions. It reflects the commitment to protect workers from potential hazards that could result in health issues or accidents. Therefore, recognizing the OSH Act as the correct answer emphasizes the legal basis for employers' responsibilities toward maintaining safety in the workplace.

The other choices refer to different areas of regulation that do not pertain specifically to workplace safety and health. The Wage and Hour Division deals with labor standards related to wages; the Environmental Protection Act focuses on environmental regulations, while the Occupational Safety Act is not a recognized legal title related to occupational health and safety. Thus, they do not fulfill the context of the question regarding employer responsibilities under OSHA.