Final answer:
Participant observation is the research technique that would most likely be used by a symbolic interactionist.
Step-by-step explanation:
The research technique that would most likely be used by a symbolic interactionist is b. Participant observation. Symbolic interactionism focuses on the subjective meanings that individuals assign to social phenomena, so observing and participating in the interactions of individuals is an important method for collecting data. This approach allows researchers to understand how people interpret symbols and meanings in their daily lives.