Which of the Following Statements Is True About Case Studies

Which of the following statements is true about case studies?

A) Case studies are not used in the study of rare problems, as people often have biased recollections of their experiences.
B) Case studies are the most apt method for capturing the uniqueness of an individual's perspective and experiences.
C) Case studies have high generalizability, that is, their findings can be applied to other individuals and groups.
D) Case studies suffer from a lack of objectivity on the part of the people telling their stories, but researchers tend to be more neutral and unbiased.