Final answer:
The expansion of the Mali Empire resulted in the spread of Islam. Hence the correct answer is option C
Step-by-step explanation:
The expansion of the Mali Empire had the effect of spreading Islam in the region.
The empire's rulers and elites converted to Islam, and as a result, Islam became the dominant religion in the empire. The spread of Islam brought about cultural changes, such as the adoption of Arabic script and the building of mosques. It also facilitated trade and cultural exchange with other Muslim societies, further expanding the empire's influence.
Hence the correct answer is option C