Final answer:
Bronislaw Malinowski was the anthropologist who first proposed the "principles of legitimacy," which are foundational ideas related to political and social structures in anthropology.
Step-by-step explanation:
As an anthropologist, Bronislaw Malinowski was the first to propose the "principles of legitimacy." This question refers to the foundational ideas of anthropology, particularly those related to political and social structures. Malinowski's work significantly impacted social sciences, influencing the way societies understand functions, norms, and the concept of legitimacy in social institutions. On the other hand, Karl Marx is most well-known for his theories regarding class struggle and its influence on the history of society. While Sigmund Freud is a psychologist who contributed to the field with his theories on the subconscious and the new morality of the 1920s, he did not propose the principles of legitimacy within anthropology. Similarly, the other options listed also do not pertain to the founding principles of legitimacy in anthropology.