The correct answer is A) the ability to travel between towns.
The thing that was needed for successful bartering between settlements was the ability to travel between towns.
Colonial settlements needed to produce enough goods or have enough products to barter with another settlement. Having that, they needed the ability to travel between towns. This meant they had to build rudimentary roads or know the existing ones at that time in order to transport the goods to other places. Another important thing was to have a medium of exchange that could create similar value for the products to be bartered.
