When people interact in an attempt to acquire a reward or a return for their actions, an exchange.
What is exchange?
An exchange means to give something in return for something. This exchange may be goods, services or any another things. There is no need that the exchange item must be of equal value of the another exchanged item or services.
An exchange happens when people interact in the anticipations of receiving a payoff or a return for their activities.
Therefore, option A is correct.
To learn more about the exchange, refer to:
https://brainly.com/question/2206977
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