Elizabeth Conducted a Study of Gambling Establishments Operated by American

Elizabeth conducted a study of gambling establishments operated by American Indian groups. She examined two establishments operated by different tribes. During the study, she spent many hours at each establishment and gained a detailed knowledge of the tribal leaders, gambling employees, and gambling customers. She also investigated how the establishments were organized, their impact on economic development in the area, and how tribal members saw them. She was conducting a

A) case study.
B) time series study.
C) summative evaluation study.
D) cohort study.