What argument does Waltz offer to illustrate that nuclear weapons are more significant a factor than economic interdependence in maintaining peace between states?

a. Since the advent of nuclear weapons, the frequency of war has declined significantly.
b. Economic interdependence may make war undesirable, but nuclear weapons make it impossible.
c. Wars have occurred between economically interdependent states but have never occurred between states with nuclear weapons.
d. Economic interdependence did not prevent World War I, whereas nuclear weapons prevented a war between the United States and the Soviet Union.
e. Presence of nuclear weapons reduces the perception of danger

Answer: d