Answer and Explanation:
c. In the given case Eric valued the goods in terms of money so here the role of money plays is the unit of account that represent something that can be used in order to value the goods and services
d. In the case when eric wants to store the money and use them in a future so here it is storing of value
e. In this case, eric purchased the lunch and pay $10 so here the food is exchanged with the money that represent the medium of exchange