Which best describes the bush doctrine of preemption?
a) a foreign policy stance that ascribes to multilateral engagement for the good and protection of an allied country.
b) a foreign policy stance that indicates a hierarchy in an alliance and puts the united states' interests first.
c) a foreign policy stance that seeks to open markerts, promote democracy, and defend weaker nations.
d) a foreign policy stance that espouses a unilateral approach to protecting the best interests of the united states.