The answer is B, usually history is passed through oral ( mouth to mouth ) so it’s not totally accurate but written records shows proof of civilization. Hope this helps!
bartering of goods for each other
Explanation:
After the decline of the Indus valley civilization, Vedic age started in the Indian history. Generally dated, between 1500-600 B.C. as most of the modern scholars agree on this date. References point to the use of barter system and metallic currency in that age. In the Vedic Age, the cow stood as a higher unit of barter and cowrie-shells were used for lower purchase
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