Which type of restriction on quantity of imports is the most transparent?

If the United States imposes a tariff on foreign chocolate, how are U.S. producers of chocolate affected?

A) The quantity of chocolate they sell decreases because U.S. consumption of chocolate decreases. B) The quantity of chocolate they produce increases. C) The price at which they sell their chocolate falls. D) They are harmed because foreign exporters of chocolate increase their supply in response to the higher price. E) They are unaffected because the quota applies to foreign producers, not to U.S. producers.

The full-employment level of output is called:

A) aggregate demand. B) aggregate supply. C) potential output. D) none of the above.