Final answer:
The CDC focuses on promoting and protecting public health, which includes overseeing disease surveillance systems and publishing health data reports. Hence, option c is correct.
Step-by-step explanation:
The Centers for Disease Control and Prevention, or CDC, is the main national public health agency in the United States, which is part of the Department of Health and Human Services. The agency is focused on promoting and protecting public health. Their efforts include overseeing the National Notifiable Disease Surveillance System (NNDSS) and publishing important public health data in the Morbidity and Mortality Weekly Report (MMWR).
Thus, the answer to the student's question is c. public health. The CDC's work covers a wide array of health concerns, including the monitoring of notifiable diseases such as HIV infection, measles, and West Nile virus infections, as well as public health initiatives like promoting diabetes care and asthma management.