Which organization's program emphasizes collaboration between employers and unions for workplace safety?

The correct choice emphasizes that the OSHA Safety and Health Partnerships (OSHA SPP) specifically encourages collaboration between employers and unions to promote workplace safety. This program is designed to improve safety and health conditions by fostering a cooperative approach to identifying and mitigating workplace hazards. By involving both employers and unions, the OSHA SPP helps to ensure that safety practices are not only implemented but are also accepted and supported by all parties involved, leading to a more effective and sustainable safety culture in the workplace.

In contrast, while organizations like NIOSH (National Institute for Occupational Safety and Health) and the CDC (Centers for Disease Control and Prevention) play significant roles in public health and occupational safety, they do not focus specifically on the collaborative programs between employers and unions as part of their core missions. The EPA (Environmental Protection Agency) primarily deals with environmental concerns rather than workplace safety collaborations, making OSHA SPP the most appropriate and relevant choice when discussing programs that emphasize collaboration for workplace safety.