Participant observation as a research strategy is an essential part of which subfield of anthropology?

cultural anthropology

Explanation:

Cultural anthropology is a branch of anthropology which focuses on the study of evolution of human cultural variation. It is distinct from social anthropology. Anthropologists have recorded earthly instances of life formed in different cultures. Several examples of these basic differences are in the processing of food and the manufacture of consumer goods in the home, clothing, tools, and processes.