In the circular flow model, O A. households demand goods and services that are supplied by firms, while supplying resources that are demanded by firms. O B. households demand goods and services, which are supplied by firms, and the firms demand resources that are supplied by intermediate firms O C. households buy goods and services and firms supply goods. Resources are supplied by other firms O D. households buy goods and services while firms sell goods and services. Firms obtain labor from households, capital from government, and raw materials from firms