​To whom is the statement, ‘the master key of realist theory is the concept of interest defined in terms of power’, attributed ?​

Correct option is A

The statement "the master key of realist theory is the concept of interest defined in terms of power" is attributed to Hans J. Morgenthau, one of the most prominent theorists of political realism. Morgenthau's work, particularly in his book Politics Among Nations (1948), emphasizes that power is the central concern of political actors, and the concept of national interest is fundamentally tied to the ability to exercise power.

In Morgenthau's theory of political realism, power is viewed as the primary driver of international relations. He argues that all political actions are motivated by a pursuit of national interest, and this interest is invariably defined in terms of power. Realist theory, according to Morgenthau, operates under the assumption that international politics is driven by human nature, which is inherently power-seeking.

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(b) Karl Deutsch:
Karl Deutsch was a political scientist known for his work on communication and integration in political systems and international relations but did not emphasize power in the way Morgenthau did.

(c) Robert Weiner:
Robert Weiner was known for his work on American foreign policy, but the quote is not attributed to him.​