Final answer:
The best illustration of barter is option B) Trading goods directly without using money, which involves a direct trade of goods or services that requires a double coincidence of wants.
Step-by-step explanation:
The best illustration of exchange through barter is B) Trading goods directly without using money. Bartering is an ancient system of exchange that predates the use of money. In a barter system, individuals trade goods or services directly without a medium of exchange like money, which requires a double coincidence of wants.
This means both participants must have something the other desires. For example, an accountant exchanging accounting services for a farmer's produce is a form of barter.
Money, as we understand it today, was developed to solve the inefficiencies of bartering, such as the difficulty of finding someone with the exact goods you need who also needs what you offer. Money serves as a medium of exchange and allows for smoother and more complex economies.