During India’s Vedic Age, trade by bartering so important because of option D: Coins were not available.
What do you mean by Vedic Age?
The India's Vedic age was also often known as Heroic age of an ancient Indian civilization.
The lack of coins affected trade as it limits the transaction of goods and services to trade by barter means of transaction only.
During this Age, people use bartering system in order to satisfying their needs and wants.
Therefore, correct option is D.
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