Answer:
The correct answer is 3) West Africa saw the rise of wealthy trading empires
Step-by-step explanation:
Trade in West Africa has been recorded since thousands of years ago. However, with the emergence of a powerful Islamic Empire in the Middle East and North Africa, Trans-Saharan trade increased considerably as traders from different parts of the continent started to trade goods.
While gold and salt were the two major trading goods, other items such as textiles and koala nuts were also major items.
By the 10th century, various powerful and rich Kingdoms emerged and their wealth was famous beyond just Africa.