Which of the following is an example of case study?

A case study is a qualitative research method that involves an in-depth investigation of a specific individual, group, event, or situation over a period of time. It typically focuses on a singular phenomenon to provide detailed insights and understanding of complex issues.

The study of Genie, who was isolated for much of her early life, fits this definition perfectly. It offers a rich, detailed account of her experiences and the implications of extreme social isolation on her development. This specific case allows researchers to explore various psychological, social, and developmental aspects in depth.

In contrast, the other options represent different research methodologies. Researching the social impact of climate change is too broad and generalizes across multiple cases rather than focusing on a deep, individual analysis. A survey on teenager social habits involves collecting quantitative data from a larger population without delving deeply into individual cases. Statistical analysis of UK demographics is a quantitative approach that focuses on numerical data and trends across a broad population, which also lacks the detailed exploration characteristic of case studies.