The correct answer is D. Mutual coincidence of wants.
Explanation
Barter is an economic activity in which two people exchange goods or services they own for goods or services they need without using money to negotiate. Barter was common among primitive peoples and the first civilizations as these negotiated with each other to obtain objects that they did not have such as spices, seeds, food, animals, among others. Additionally, the only element necessary to barter is that the two individuals are interested in the good or service of the other individual (a mutual coincidence of wants) so that there can be an exchange. So, the correct answer is D. Mutual coincidence of wants.