Final answer:
Condemning practices of other cultures rather than your own contradicts the principle of cultural relativism, as it involves judging another culture by one's own standards, which is characteristic of ethnocentrism. The correct option is B.
Step-by-step explanation:
The principle contradicted by the condemnation of practices engaged in by members of a culture rather than your own is cultural relativism. Cultural relativism is the practice of assessing a culture by its own standards rather than viewing it through the lens of one's own culture.
In contrast, ethnocentrism involves evaluating and judging another culture based on how it compares to one's own cultural norms, and it implies a belief that one's own culture is better than all others. Therefore, when one condemns the practices of other cultures, they are being ethnocentric because they are not applying cultural relativism, which would seek to understand these practices within their cultural context.