According to the circular flow model, how do households participate in the two markets?

a. They buy the stuff they want in the resource market and sell their labor in the goods and services market.
b. They buy the stuff they want in the goods and services market and sell their labor in the resource market.
c. They sell the stuff they want in the goods and services market and buy labor in the resource market.
d. They sell the stuff they want in the resource market and buy labor in the goods and services market.