Final answer:
David Campbell's approach most closely aligns with Constructivist theory, which accounts for the social construction of international relations and the importance of norms in shaping foreign policy, contrasting with Realist foreign policy, which focuses on state self-interest and power.
Step-by-step explanation:
David Campbell's work develops a performative theory of identity in the context of international relations and foreign policy analysis. The most fitting label for the theoretical approach that values the power of norms and identities in shaping state behavior is B) Constructivist theory. Constructivism explains that states are motivated by normative structures and are driven to align with international norms and values. This approach emphasizes the social construction of global politics, the importance of identity, and the role of international norms in influencing state actions and foreign policy.
By contrast, Realist foreign policy assumes that states act primarily in self-interest, focusing heavily on security and power dynamics, while constructivism sees international relations as socially constructed through the interactions and shared understandings of actors. This dynamic is expressed in the way that states value 'democratic' or 'rogue' status and change their behavior in response to international expectations. Thus, Campbell's work diverges from realism, emphasizing how identity and perception are performed and presented on the international stage.