When people interact in an effort to receive a reward or a return for their actions, a(n) has taken place. exchange barter division of labor both b and c?

When people interact in an effort to receive a reward or a return for their actions, an Exchange has taken place

And exchange refer to a give and take situation that benefit both parties. In this case, the people GIVE their effort, time, and skills and TAKE the reward or return for their actions