Final answer:
Saint Domingue's economy relied on plantations of cotton, sugarcane, and coffee beans, which were worked by a large enslaved African population.
Step-by-step explanation:
Saint Domingue's economy was heavily dependent on plantations. This French colony, now known as Haiti, was known for its huge plantations of cotton, sugarcane, and coffee beans. To maintain such large-scale agricultural activities, they relied heavily on enslaved Africans for labor. In fact, by the mid-1700s, a large portion of the island's population was enslaved to work on these plantations, making it a pivotal part of the French colonial economy.