According to Power Transition Realists, Why Is It That the United

According to power transition realists, why is it that the United States could launch a preemptive war unilaterally?

A) because international institutions gave special powers to the United States to act unilaterally
B) because the United States had an internationally mandated mission to protect and promote democracy
C) because the United States had an extraordinary concentration of power in national wealth, military expenditures, and composite measures of power
D) because terrorism as a threat could not be tied to any state actors, so the United States could launch a war to wipe out terrorists preparing to attack