Answer:
Options a, b and d. The following are some of the inventions or ideas that helped to advance trade: flat-bottomed boats, carts driven by animals, and seagoing vessels.
Explanation:
All of these inventions, the use of animals to drive and hold carts that could transport people and goods, the invention of flat-bottomed boats that allowed people to navigate through shallow waters such as rivers or anglers, and the seagoing vessels that made it possible for explorers to travel long-distance and through vast open water, were all creations that significantly helped civilizations to develop their trades system, explore new areas and create routes such as the silk or spice route that connected different continents and produce an international trade network.
