There were some other interesting findings in the report. For instance, the least happy adolescents used screens for twenty hours or more a week. However, adolescents who had between one and five hours of screen time a week were happier than those who didn’t have any.
This excerpt would be most useful for a research paper on which topic?
A. the uses of smartphones
B. the future of smartphones
C. the benefits of smartphones
D. the convenience of smartphones