In the Just War Tradition,proportionality

In the just war tradition,proportionality

A) refers to the principle of noncombatant immunity.
B) implies that the harm done by an act may not be disproportionate to the good sought or the evil to be avoided.
C) implies that war should be engaged only as a last resort after diplomacy and negotiation have failed.
D) implies that war is justifiable when waged against class oppression or national subjugation.