Which research approach involves a detailed in-depth examination of a single group or event?

• A. Field experiments
• B. Laboratory experiments
• C. Case study
• D. Longitudinal survey

Answer: (C)

Case studies are about a detailed, in-depth examination of a single group or event, focusing on its context, dynamics, and meanings. They gather information from multiple sources—interviews, documents, observations—to build a thorough picture of how and why things happen in that setting. This approach suits tasks that aim for rich understanding of complexities and processes, rather than broad generalizations. The other methods have different aims: field experiments test effects by manipulating conditions in real settings with more than one group; laboratory experiments do this in controlled, artificial environments; longitudinal surveys track the same people over time to observe changes across a population, not to analyze one case in depth.