Respuesta :
Answer: I think it is B. Levees held back the annual floods of the Tigris and Euphrates Rivers.
Explanation:
The part of Sumerian farming and trading are:
- Levees held back the annual floods of the Tigris and Euphrates Rivers;
- Surplus barley and wheat could be traded for other things.
- This is because the Sumerians use Levees and canals as a means of irrigation system which helped to manage the annual floods of their two important rivers; Tigris and Euphrates.
- Also, because they could only cultivate grains such as barley, and wheat but not cash crops, or explore mineral resources, they traded them for other things.
Hence, in this case, the correct answer is options B and C.
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