An example of comparative advantage refers to the ability of a country or producer to carry out a particular economic activity more efficiently than another activity. In the provided options, the one that aligns most closely with the concept of comparative advantage is:
lower-priced corn grown by U.S. producers with government subsidies and large-scale mechanized agriculture.
This option indicates that U.S. producers can grow corn at a lower price due to efficiencies gained from large-scale mechanization and possibly lower costs of production supported by government subsidies, suggesting that they have a comparative advantage in corn production compared to other countries or activities.