Final answer:
Focus groups are an example of qualitative research, involving subjective data collected through discussions that provide insights into behaviors and motivations.
Step-by-step explanation:
The example of qualitative research among the options provided is C. Focus groups. This type of research involves in-depth interviews, focus groups, and/or analysis of content sources as the source of its qualitative data. Such data is often descriptive and subjective, reflecting personal insights, opinions, and experiences, which cannot be quantified statistically but are valuable for understanding the underlying reasons, motivations, and attitudes behind particular behaviors and phenomena.