Cultures, people, and goods spread out and mixed if world change when the oceans became highways. Thus the correct option is A.
What are oceans?
The ocean is a continuous body of salt water that covers more than 70 percent of the Earth's surface.
In the middle ages, silk road has been the most notable route for trade spices, grain, fruits, vegetables and other commodities. Still, there were other routes to take to transport commodities from China to India. The Indian ocean was an overlooked trade route it was the perfect place to transport cotton, and ivory, and spices for trade at that time.
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