People are biological creatures as well as rational human beings. In order to gain a complete understanding of any aspect of human behavior, the field of anthropology adopts what strategy?

The answer is the four-field approach.

Explanation:

This approach sees anthropology as composed of four fields:

Archaeology, which studies physical material from different cultures; Linguistics, which analyses language, as well as its historical and social context; Biological anthropology, which studies biological and behavioral factors of human beings, and our ancestors'; and Cultural anthropology, which studies the way culture evolves over time.