The city of became a leading center for muslim scholarship and trade.
a. cairo b. timbuktu c. morocco d. mali.

The Timbuktu became a leading center for Muslim scholarship and trade

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Option B.

Explanation:

Timbuktu, is the right answer.

Timbuktu, a city in the Mali country has great significance as a trading station on the trans-Saharan expedition course and as a hub of Islamic culture. Throughout the 14th century, this city developed as a center for the trans-Saharan salt and gold trade and as a center of  Islamic culture. Following its capture by Morocco, the city began to decline by the year 1591.