The historical achievements/events that Mansa Musa is renowned for include "a grand hajj across the Saharan Dessert bringing thousands of people and hundreds of pounds of gold which advertised the great wealth and trade capabilities of the kingdom of Ghana."
Other things Mansa Musa was known for in the available options include the following:
Establishing the city of Timbuktu as the next great cultural and trade city; competing with Baghdad and Constantinople in its grandness and desirability for people to come there.
Making people from other lands aware of the fine goods available in the Empire of Mali by showing off these goods on a grand caravan across Africa.
Option B is wrong because Mansa Musa never takes a voyage across the Atlantic Ocean in his lifetime.
Hence, in this case, it is concluded that the correct answer is options A, C, and D.
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