Question

Most historians believe that the Sumerian civilization declined due to A. the drying up of the Tigris and Euphrates rivers B. constant rebellion within the empire and invasion from outside C. extensive drought and the lack of rainfall over many years D. a devastating plague that killed thousands of Sumer's citizens? ​

Answer 1

B. constant rebellion within the empire and invasion from outside.

Step-by-step explanation:

Answer 2

I am 100 percent is it is B.

Step-by-step explanation:

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