Each of the following is an example of an appointed official, EXCEPT:
A. a pound keeper who manages animal control
B. a town mayor who makes all executive decisions
C. a fire warden who manages the volunteer fire department
D. a tree warden who monitors tree height and roadway blockage

The quote below is an excerpt from the charter of the united nations: "the purposes of the united nations are: to maintain international peace and security, and to that end: to take effective collective measures for the prevention and removal of threats to the peace, and for the suppression of acts of aggression or other breaches of the peace, and to bring about by peaceful means, and in conformity with the principles of justice and international law, adjustment or settlement of international disputes or situations which might lead to a breach of the peace . " source:this section implies that the united nations is prepared to do what to keep world peace?