Answer:
The most relevant option among these for a research paper arguing that cell phones should be banned from school campuses would be option c, i.e., studies showing a connection between lower test scores and cell phone use at school. This option directly supports the argument and provides evidence to show why cell phones can have a negative impact on students' academic performance. Options a, b, and d are not directly related to the central argument of the paper and do not provide any support for the claim that cell phones should be banned from school campuses.