Which of the Following Is Not Characteristic of United Nations

Which of the following is not characteristic of United Nations peacekeeping activities?

A) The parties to a dispute must consent to UN intervention.
B) Peacekeeping has been particularly effective in dealing with new, gray-area conflicts, such as ethnic and religious-based civil conflicts.
C) Peacekeeping tends to attack the symptoms, not the causes, of conflicts.
D) Peacekeeping activity was extensive in the aftermath of the Cold War.