The correct answer is A) Encomiendas.
The labor system that forced Native Americans to work on plantations in the Americas was the system of Encomienda.
It was the Spanish in the mid-1500s, the Spanish conquerors establish a slavery system that forced Indians of the Americas to work for them. It started in Peru and the Caribbean, where Indians worked for the landowners in exchange for shelter and education, that mostly was evangelization.
The word Encomienda is a Spanish word that can be translated as "to entrust." So prominent and wealthy Spanish people were granted big portions of land and made Indians worked for them