The correct answer to this open question is the following.
Although there are no options attached, we can say the following.
The trade routes were both by sea and over long stretches of land including the well-known routes running between Europe and Asia at the western edge of the Silk road.
We are talking about trade during the Middle Ages. A medieval time in Europe were trade routes connected this continent with far places such as Africa and Asia. It started in the far east, in China, and ended in modern-day Turkey.
Through the network called the Silk Road, nations and people traded, gold, silver, salt, spices, ivory, tea, gunpowder, and many other raw materials and natural resources.