Explanation:

- Malinowski: Focused on how cultural practices fulfill individual biological needs, not exactly on the part-whole relationship for the "well-being of the whole."

- Emile Durkheim: Studied how different social institutions keep society cohesive, but didn't define function in these terms.

- Herbert Spencer: Compared society to a living organism, but his definition of function was different and broader.

- Radcliffe-Brown: Defined function as “the contribution of a part to the maintenance and well-being of the whole” within the social structure. He emphasized the interdependence of societal parts.

Correct Answer: Option 4 – Radcliffe-Brown