Trade brought people together with the exchange of goods, raw materials, and ideas. this was possible due to:

advancements in communication
advancements in transportation technologies
merchants acting as agents for leaders
cultural openness toward others

The correct answer is B) advancements in transportation technology.

Trade brought people together with the exchange of goods, raw materials, and ideas. That was possible because of the advancements in transportation technology.

When modern transportation technologies such as the train appeared, trade changed forever. Railroads represented a huge leap in the transportation of products from coast to coast. Nowadays, modern means of transportation like cargo ships and cargo airplane have enormously facilitated commerce around the globe. What used to take days, now take hours. And modern software in computing facilitates the import and export process.

the awenser wuold be slaves

that is probably something for you to answer