I believe it is A. religious wars and conflicts related to the beliefs of the two largest faiths.
At this time in the Neolithic, c. 7000-6,000 B.C.E., people were often buried under the floors of homes, and in some cases their skulls were removed and covered with plaster in order to create very life-like faces, complete with shells inset for eyes and paint to imitate hair and moustaches.
B both countries were involved in a system if alliances.
The answer would be ORVAL FAUBUS if you are on apex
