The barter system was the oldest form of the commerce system. The trading of the sheep or cow best illustrates the bartering. Thus, option A is accurate.
What is the barter system?
A barter system was an early approach to business, trade, and commerce that involved the exchange of services, products, and goods between two groups instead of using currency.
In early times the parties exchanged goods among them without involving money. For example, trading livestock like sheep or cows in exchange for food like wheat.
Therefore, option A. trading of cow and sheep is an example of a barter system.
Learn more about the barter system here:
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