Which of the following is a method used by the CDC to promote health?

The method used by the CDC to promote health that is highlighted here is conducting research and supplying resources. This approach is fundamental as it underpins the organization’s ability to identify public health issues, understand disease patterns, and develop interventions. By engaging in rigorous research, the CDC can gather and analyze data that informs guidelines, policies, and programs aimed at improving health outcomes across diverse populations.

In addition to research, supplying resources—whether in the form of health education materials, funding for public health initiatives, or technical support for health departments—amplifies the CDC's efforts in promoting preventive measures and health awareness. This dual function is critical in crafting effective health communication strategies and ensuring that local health agencies have the tools they need to respond to health crises.

Other options may contribute to health promotion in various ways but do not encapsulate the core strategy of the CDC. For instance, while increasing the number of hospitals in rural areas can improve access to care, it does not directly align with the CDC's primary mission. Reducing the number of healthcare workers would negatively impact health systems, and utilizing social media for marketing, while useful for outreach, is more of a tactic rather than a comprehensive method for promoting health on the scale that the CDC employs.