The correct answer is D) it would prevent the rise of totalitarianism.
The statement that best describes the reason the United States believed that prosperity in Europe could reduce the likelihood of future wats is that it would prevent the rise of totalitarianism.
Totalitarianism is the absolute control that a ruler has over his people and territory. The ruler or leader in a totalitarian country can exert his power and authority in everyone. Totalitarianism was a reason for invasions and armed conflicts in the past. Such as the case of monarchies in Europe. That is why the United States considered that a prosperous Europe could reduce their ruler's intentions of expansionism and armed interventions. If their countries were prosperous, there would be no reason to be totalitarianism.