The response that best explains how the American, French, and Haitian Revolutions are related is:
Debt from supporting the American Revolution led King Louis XVI to raise taxes at the Estates-General. The Third Estate objected to new taxes and wrote the Declaration of the Rights of Man and of the Citizen. The declaration inspired a revolt of the enslaved population in Haiti.
This explanation effectively connects the three revolutions by highlighting the financial strain on France due to the American Revolution, the response of the Third Estate in France that led to the Declaration of the Rights of Man and of the Citizen, and how this in turn inspired the Haitian Revolution against slavery and colonial rule.