Final answer:
The correct term for a defense mechanism that involves self-justifying explanations is rationalization. It provides socially acceptable reasons for actions that arise from unconscious conflicts.
Step-by-step explanation:
The defense mechanism in which self-justifying explanations replace the real, unconscious reasons for actions is known as rationalization. This occurs when someone justifies behaviors by substituting acceptable reasons for the less-acceptable real reasons, which serves to reduce anxiety that arises from internal conflicts. Rationalization is a way for the ego to defend itself by creating a set of believable excuses for actions that might otherwise be deemed unacceptable.