Which of the following was an effect of the neolithic revolution that allowed trade to begin in early civilization

The correct answers should be food surplus, or specialization of jobs. People who dealt with food production started producing more than what was necessary for survival, and this food was used in trade. Specialization helped create people who were builders, people who dealt with agriculture, shepherds, and similar. Then for example, a person would fix someone's roof and in return get some food. This was the primal concept of trade.