The best response that distinguishes the key causes of the American, French, and Haitian Revolutions is:
The American colonists wanted to control their own government; the French people were starving with no relief from the king; the Haitian people wanted freedom from slavery.
This response accurately reflects the primary motivations behind each revolution: the American colonists sought independence and self-governance from British rule, the French populace was driven by economic hardship and desire for reform against monarchy, and the Haitian revolutionaries fought against slavery and for their freedom.