Which of these claims would constitute a micro theory to explain the persistence of war throughout history?

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Claim C suggests that war persists because it is rooted in a fundamental aspect of human nature - aggressiveness. This is a micro theory as it places emphasis on individual-level factors (i.e. human nature) as opposed to macro-level factors such as international institutions (D) or national interests (B). Claim A is more of a normative statement rather than a micro theory, and claim D doesn't provide a specific micro-level explanation for the persistence of war.

Which of These Claims Would Constitute a Micro Theory to Explain