The correct answer to this open question is the following.
Although you forgot to include the options for this question we can answer the following.
The Sumerians, Babylonians, and Phoenicians traded goods as far as Africa, Asia, and Europe, and their main exports were textiles and grain.
The Sumerians are considered to be the oldest civilization on planet Earth. They stopped being nomads and settled in the middle of the Rivers Tigris and Euphrates, in the Middle East, modern-day Iraq. There, they learned to grow crops, benefiting from the flood of the rivers to grow with crops and extensively farm the lands.
That is why they were capable of establishing impressive and powerful city-states such as Lagash, Kish, Uruk, Nippur, and Eridu.