By what millennia are archeologists certain that large scale beer production had begun in the middle east?

The Sumerians, the earliest civilization of the Middle East, made beer, though their production techniques remain unknown. It is believed they made beer from barley. Scholars estimate that beer was being regularly produced  in Mesopotamia around 3500-3100 BCE (fourth millenium).

Explanation:

the answer should be a. the sui empire, the tang empire extended from korea in the west to manchuria in the east.