What Is One of the Major Advantages of Field Research

What is one of the major advantages of field research compared to other qualitative approaches?

A) Participants in the study tend to feel empowered.
B) Participants can give accounts in their own words and unexpected responses are encouraged.
C) It's possible to make comparisons across time and space.
D) The researcher is able to gain a deep understanding of a group and its members.
E) Implied meanings in "text" situations can be revealed.