Answer:
The answer is D.
Each side was able to gain land during the war. It went back and forth for a long time. The south invaded the north all the way up to the Chinese border until China decided to aid North Korea and pushed the south back down to its land. It went on like this for some time until finally the war stopped and the border between the north and the south stayed the same. The area between the border is called "No Man's Land" because not a single man has stepped foot there since the war ended. There are land mines there and who knows what kind of animals live in between the borders of North and South Korea.