Which pair does not represent a pair of resonance structures? 
Definitions:
Corn Laws
The tariffs, subsidies, and restrictions enacted by the British Parliament in the early nineteenth century to discourage imports and encourage exports of grain.
Imports
Products or services imported from one country into another for the purpose of selling or utilization.
Exports
Goods or services produced in one country and sold to buyers in other countries.
Bushel
A unit of volume that is used in the United States for measuring agricultural commodities, such as grains.
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