The Case Studies That Have Become Social Science Classics Describe

The case studies that have become social science classics describe specific people and places,but

A) also provide a sense of understanding about general categories of the social world.
B) lack generalizability.
C) have been particularly weak at generating new ideas and theories.
D) are not particularly appropriate for exploratory or descriptive purposes.
E) both lack generalizability and have been particularly weak at generating new ideas and theories.