The correct response is:
European colonizers’ cruelty, as well as the spread of disease, meant that many Indigenous people died. As a result, there were not enough people left for colonizers to enslave.
This explanation underscores the impact of European colonization on Indigenous populations, which included acts of violence, exploitation, and the devastating effects of diseases brought by Europeans. These factors significantly reduced the Indigenous population, making it difficult for colonizers to rely on them as a labor force for plantations.