The primary purpose of the United Nations is to

The purpose of the United nations is to "preserve peace, advance justice and constitute a permanent structure for international cooperation.".  The United Nations acts as a world forum to help countries work together to achieve peace and human rights.

Explanation:

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the fact that could also be added to column b is that during world war ii, specifically between the years 1941 and 1945, japan expanded its territory towards the indonesian territory in what was known later as part of the "pacific war". in that time, japan could conquer the philipines, singapore,   borneo, central java, malang, cebu, sumatra and various other islands of the area, therefore expanding its territory for a brief period of time.