Which of the Following Correctly Distinguishes Case Studies

Multiple Choice

Which of the following correctly distinguishes case studies
From ethnographies?

A) Ethnographies are usually more limited in time, space, and types of data collected than case studies.
B) Case studies are usually done covertly; ethnographies usually require cooperation from management.
C) Ethnographies collect more varied types of data than case studies.
D) Case studies require participant-observation, while ethnographies can be done through participant-observation or nonparticipant-observation.
E) Case studies are unable to take the worker's perspective into account.