The option that most directly contributed to the expansion of the transatlantic slave trade during the 1700s is demand for slaves in the American colonies to produce cash crops.
During this period, colonies in the Americas were heavily invested in the production of cash crops such as sugar, tobacco, rice, and cotton, all of which required a substantial labor force. As the economy of these colonies grew, so did the demand for enslaved labor to cultivate and harvest these crops, leading to an increase in the transatlantic slave trade.