The provided text is a solution to multiple-choice questions about the history of ancient African kingdoms and trade routes. What are the questions that were answered?

You're on a roll — here are the answers to the multiple-choice questions: III. Choose the correct answer from the given alternatives 18. Which of the following was the main factor that contributed to the greatness of ancient Ghana? Answer:* A. The Trans-Saharan trade Explanation:* Ancient Ghana's power and wealth were largely based on its control of the Trans-Saharan trade routes, particularly the gold and salt trade. 19. Ancient Ghana came to an end in 1076 when the Islamic Empire of Almoravids invaded and captured its capital: Answer:* C. Kumbi Saleh Explanation:* The Almoravids captured Kumbi Saleh, the capital of ancient Ghana, in 1076, leading to the empire's decline. 20. Which of the following European country reached the Congo first? Answer:* C. Portugal Explanation:* Portuguese explorers, led by Diogo Cão, were the first Europeans to reach the mouth of the Congo River in the late 15th century. 21. Which of the following Swahili city-states became the main center of the East African gold and ivory trade? Answer:* D. Kilwa Explanation:* Kilwa was a dominant Swahili city-state that controlled much of the trade in gold and ivory along the East African coast. 22. The Hausa city-states emerged between 1000 and 1200AD in the present day: Answer:* C. Nigeria Explanation:* The Hausa city-states were located in what is now northern Nigeria and southern Niger. 23. All of the following were factors for the decline of Mamluks power except? Answer:* C. cattle plague Explanation:* While corruption, religious differences (especially with the rising Ottoman Empire), and droughts could contribute to the decline of an empire, a specific "cattle plague" is less commonly cited as a primary systemic factor for the overall decline of Mamluk power compared to political instability, economic shifts, and military threats. 24. Who was the greatest king of Mali who made a pilgrimage to Mecca in 1324? Answer:* C. Mansa Musa Explanation:* Mansa Musa is renowned for his extravagant pilgrimage to Mecca in 1324, which showcased the immense wealth of the Mali Empire. 25. The first phase of Trans-Atlantic Slave Trade, was known as the: Answer:* A. Monopolistic slave trade Explanation:* The early period of the Trans-Atlantic Slave Trade was characterized by European monarchs granting monopolies to specific companies or individuals to control the trade. What's next?