I would go with B. I am not sure just because I do not know the context, but B makes the most sense to me. Hope this helps
Mansa<span> was their name for "King" or "Emperor") was a devout Muslim and his actions, such as his pilgrimage to Mekkah, which he did along with a huge number of slaves, contributed to the spread of the Islamic culture and religion. hope it helps =)</span>
Here's the answer in picture form