About 46,000-51,000 people died.
A possible reason was the attacks on them by crusaders and mongols around the 11th and 12th centuries. Another reason could have been the Arab rulers removing taxes from non Muslims and doing other things that hurt there income.
It would be C) it decreased the amount of pirates and thieves
The Haitian Revolution has often been described as the largest and most successful slave rebellion in the Western Hemisphere. Slaves initiated the rebellion in 1791 and by 1803 they had succeeded in ending not just slavery but French control over the colony.