Explanation: The encomienda system granted land and an allotment of Indians to a Spaniard. The Indians were required to work for free, and in exchange the Spaniard was supposed to protect them and provide for their Christian education. Slavery of Indians (though not of Africans) was officially banned by Spain in 1542 (A). Indentured servitude refers to the system of repaying one’s passage to the Americas by working for a specified period of time for free. It was primarily used by Europeans (B). The apprentice system is a system of learning a trade by working for a master craftsman for a specified period for low or no wages (D).