Answer:
The Sun Dance is one of the most important and renowned ceremonies practiced by pretty much all Natives of the Plains region and it represented a renewal of the bond between the tribes and the earth spirit
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Television did that. People watched their advertisements then they knew about it, they tried and they loved it. So, TV encouraged them
In short, Option C is your answer
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The answer is trade barrier.
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I think it's B. Not 100% sure but I'm about 80% sure.