The results of the 2010 UNAIDS report on the worldwide AIDS epidemic suggested that the incidence of new HIV infections may have decreased because of ______.

A) AIDS-related deaths
B) weather patterns
C) the development of effective medical treatments
D) prevention efforts

The 2010 UNAIDS report suggested that the incidence of new HIV infections may have decreased because of prevention efforts, including increased access to HIV testing, counseling, and treatment, as well as behavior change programs and condom promotion. The report did not suggest that AIDS-related deaths or weather patterns were significant factors in reducing new infections, although access to effective medical treatments may also have played a role.