The ancient Greeks often referred to non-Greek people as "barbarians." Why was this term most likely used?

The Greeks used “barbarian” for people who did not speak Greek, whose speech could sound to them like unintelligible “bar-bar” sounds. The term helped distinguish Greek-speaking society from outsiders and was often used dismissively, rather than to praise other cultures or describe shared roots or trade. The best answer is D, to differentiate Greek civilization from others, often in a derogatory manner.

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