Answer:
The most suitable answer is C. Since World War II, conflicts have become more complicated and less successful.
Step-by-step explanation:
After the World war 2, the containment policy led by USA to keep the communism at bay included the increase of US military bases throughout the world.
However, the military conflicts since the 2nd world war has become far .ore complicated and less successful. Moreover they have taken a more political form rather than pure military conflicts. Examples are the Korean war, Vietnam war and the still ongoing war on terror in the middle east and Africa.
Because of this, use of military interventions as a tool of foreign policy has proved to be less successful.