When does archeology become archeology and not grave robbing

When the people were buried in the last 75 years it's grave robbing. When the people were buried 1000 years ago, or even much less, it's archeology. When graves are very old they offer a chance to learn so much about the past.

Explanation:

c. as a force against soviet invasion of afghanistan

entering that problem on the tube you may come up with an answer