Answer:
C. They labeled people based on skin color.
Step-by-step explanation:
The term "Blacks" was used by Europeans to categorize people of African descent based on their skin color. It was a simplistic and superficial way of categorizing people, focusing solely on their physical appearance rather than their individual identities or cultural backgrounds. This racial categorization played a significant role in the historical context of slavery, colonization, and the perpetuation of racial discrimination and inequality.