Matthew is completing his master's thesis, which addresses the culture of outlaw motorcycle gangs. for the past six months, he has been riding with a gang, observing and describing behaviors in an attempt to present a view of these groups from a gang member's perspective. like mario brajuha, he is determined to keep the identities of his subjects confidential. which research method is matthew employing?
a. case study
b. documentary
c. unobtrusive measures
d. participant observation

Participant observation is one sort of information collection strategy regularly utilized in subjective research. It is a broadly utilized system in numerous disciplines. Its point is to pick up a close commonality with a given gathering of people and their practices through a serious inclusion with individuals in their social condition, for the most part over a broadened time frame.