Final answer:
Columbus planned to enslave the natives (option a) and bring them back to Spain. He kidnapped some Arawak people, which led to the establishment of the exploitative encomienda system by later Spanish settlers.
Step-by-step explanation:
When Christopher Columbus returned to Spain after his voyage to the Americas, his plan regarding the natives was not established on principles of mutual respect or peaceful trade. Instead, he set a precedent for the later exploitation of native populations through systems like the encomienda system. Columbus kidnapped some Arawak people and took them with him back to Spain. The encomienda later allowed Spanish settlers to essentially enslave the indigenous people for labor and tribute under the guise of offering protection and Christian teachings. In actuality, this system led to severe abuse and exploitation of native peoples.
This exploitation continued with successors like Hernán Cortés, who sought wealth through labor and tribute from natives. The repartimiento system, which required native towns to supply labor for Spanish overlords, also followed similar patterns of exploitation. The Spanish colonization practices vastly altered and often devastated the native populations, with enslavement being a cornerstone of these practices.