Final answer:
The IR theory that asserts state dominance by the bourgeoisie and international structure by capitalism is Radicalism(option D), related to Marxism.
Step-by-step explanation:
The International Relations (IR) theory that holds that the state is dominated by the rich, bourgeoisie class, and that the international system is structured by the international capitalist system is known as Radicalism, which is often associated with the Marxist approach.
This theory posits that the dominant bourgeoisie class uses the state as an instrument to enforce its ideology and to maintain its hegemonic position within the international capitalist system. Such a perspective is critical of mainstream IR theories and asserts that the true nature of international politics can only be understood through the lens of social and economic inequalities, class struggle, and the distribution of power within the global economy.