Answer:
Hi!
The answer would be option D, trade bread for wheat.
Step-by-step explanation:
To answer this question we first need to know what a barter system is.
The barter method refers to a system in which people exchange goods or services for other goods or services without the use of currency. In this system, you wouldn’t buy, sell or earn anything, you’d only trade a good or service for another good or service. Therefore, the answer is D