What does OSHA require from chemical manufacturers and suppliers?

The correct response highlights OSHA's requirement for chemical manufacturers and suppliers to provide a Material Safety Data Sheet (MSDS) for hazardous chemicals. This requirement is crucial because an MSDS contains vital information about the properties of each chemical, including handling instructions, potential hazards, and emergency procedures in case of exposure or accidents.

This ensures that workers and employers are informed about the chemicals they may encounter in the workplace, allowing them to implement necessary safety measures to prevent injuries and illnesses. Access to this information helps in training workers effectively on chemical safety, thus fostering a safer work environment.

The other options, while related to safety and training in various contexts, do not align with OSHA's specific requirements concerning chemical safety and hazard communication. User manuals for machinery, food safety certification, and safe food handling training programs are essential in their own rights but fall outside the scope of what OSHA mandates from chemical manufacturers and suppliers.