Why Is Switzerland Considered a Pluralistic Society

Why is Switzerland considered a pluralistic society?

A) Though it has multiple cultures, they all enjoy equal social standing and coexist on equal terms.
B) It has only one homogeneous culture, dating back many centuries.
C) Its relative isolation, thanks to the mountains that surround it, means it has not experienced an influx of people from other cultures.
D) Its location in the center of western Europe has made it a "crossroads" for centuries, resulting in toleration of "outside" cultures.