The key to the origin of the cities was the development of more efficient agriculture. About 6,500 years ago, Bulgaria was home to the older town in Europe. It's 350 residents made their living __________ for trade.
A) fishing
B) producing salt
C) growing corn
D) domesticating livestock

Question

Quizplus · Accepted Answer

As the question mentions that the town's residents made their living "for trade," it suggests that they were producing a commodity for sale or barter. Among the given options, producing salt would be the most likely candidate as it was a valuable commodity in ancient times and could be easily transported for trade.

The Key to the Origin of the Cities Was the Development