What did the Haitian revolution involve?
What was thriving in the French colony of Saint Domingue by the 1700s?

Slaves and Haiti as a Colony.

Now by 'thriving' im going to assume you mean in trade. Post 7-Years War Sugar(Both raw and refined), Indigo and Cotton. Prior to the 7-Years war, Sugar and Coffee.

Explanation:

The Haitian Revolution of 1791 was a one of the most successful slave revolts in history. Haiti at the time was a French Colony and after the Revolution.By the lead of Toussaint L’Ouverture, The Haitian slaves had completely over-ran the French, to the point they pushed them out fully.

In Saint Domingue (Modern day Haiti), Two Times of thriving trade happened. Post and Prior 7-years war Trade. The Colonies main export was Sugar in both times. With Coffee, Indigo and Cotton also being main exports of Haiti.

ok sorry the answer is a. by their religion