Answer: C. NATO
Explanation: According to the given criteria, it is a military alliance of European countries and North America. This military alliance was originally established as a counterweight to Soviet domination in Eastern Europe and a desire to spread communism. At that time it consisted mainly of Western European countries and America, although today with changed conditions in the world, membership has significantly expanded to the former countries of the Eastern European bloc. Also, the activities of this alliance have spread from the military, to actions to help countries that have suffered a natural disaster, and the like.