Answer:
c. It must include both qualitative and quantitative methods.
Explanation:
For the research of behaviors related to various reactions to different types of media, I will consider both qualitative and quantitative methods.
Qualitative and quantitative methods together provide more comprehensive results of the research. Qualitative methods give the quality of the media type and quantitative methods will give quantitative data such as how many people are using the particular media type and for how much time.
Hence, the correct answer is " c. It must include both qualitative and quantitative methods."