Concept:The spread of Islam in West Africa is linked to the religious reforms of the Mali emperors.
Explanation:Mansa Musa ruled the Mali Empire from 1312 to 1337 CE.
He was a devout Muslim and made Islam stronger in his kingdom.
After his pilgrimage to Mecca, he brought back Muslim scholars and architects.
These scholars helped build mosques and learning centers in cities like Timbuktu.
He also made Friday congregational prayer (Jumu'ah) an official institution in Mali.
This means he is the ruler credited with instituting Friday prayers in the empire.
No other Mansa in the options is associated with this specific religious reform.
Answer:A. Mansa Musa