The correct answer to this open question is the following.
You forgot to include the options for this question. However, we can say the following.
The type of research design in this study is "a case study."
In this type of study used in social sciences in which scientists are going to apply a methodology to study a group of people or a person. In this case, the scientists surveyed 5,000 people about what shows they typically watch, and also had them answer a series of questions about current events. This had the purpose of analyzing whether people who watch comedy news shows get more or fewer questions correct.
When researches decide for a case study, they apply an intensive investigation of the group to be analyzed to get valuable information on different variables.