Step 1: Define ethnography.
Ethnography is a qualitative research method rooted in anthropology and sociology, emphasizing immersive observation.
Step 2: Examine each option.
(A) is correct: Ethnographers often live within the community for long durations.
(B) is incorrect: Experimental and controlled groups are typical of quantitative research, not ethnography.
(C) is correct: Field observation is a major component of ethnographic study.
(D) is correct: Ethnography seeks to understand behaviors in their cultural context.