Answer:
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The answer is C. is involved in activities that center around a narrowly defined subject.
Yes, it is true that North Korea has been actively developing and testing nuclear arms for the last decade, since most of their facilities and tests are easily traceable.
The two years prior to World War I in the region of the Balkans saw the rising of Serbian nationalistic Groups. Later came the assassination of the Archduke Ferdinand in the Balkan City of Sarajevo, main cause of the war.