Which of the Following Is an Idea That Limits a Cosmopolitan's

Which of the following is an idea that limits a cosmopolitan's practice of tolerating different cultural practices?

A) Every human being has obligations to every other human being, so each person matters ethically.
B) Cultural differences will not go away.
C) It is important to distinguish between cultural practices that matter ethically and cultural practices that are ethically insignificant or trivial.
D) Cultural practices of ethical excellence identify key ethical values.