Which of the following choices best illustrates the concept of Adam Smith's "invisible hand"? A Vietnamese farmer grows rice, an exporter ships it to the United States, and a grocer in New York sells it to a customer. A fishery's stock of fish becomes depleted due to overfishing as boats from around the world converge. A government regulates a firm to clean up the pollutants the firm has released as part of its production process. An apartment building that provides much-needed housing is built on the site of the only playground for children in that town.