Which had the biggest impact on economic growth in Sumerian city-states?

Explanation:

Do you mean to ask

"what had the biggest impact on economic growth in Sumerian city-states?"

I would like to thank trading in between and among city states had the biggest impact on the economic growth.

Sumeria has been adjudge to be the oldest civilization on our planet. Historically, they existed in the present day Middle East, specifically, Iraq. In between two rivers, the Tigris and that of the Euphrates. They farmed and practiced agriculture and enjoyed the presence of the rivers in between their

land. The rivers made their land quite fertile because of the flood that occurs. Due to these, they developed a host of important city states which includes Uruk, Ur, Eridu and others.

answer; ///i do believe that the correct answer is (b) ///middle colony