A website offers a place for people to buy and sell emeralds, but information about emeralds can be quite imperfect. The website then enacts a rule that all sellers in the market must pay for two independent examinations of their emerald, which are available to the customer for inspection.

the correct answer is "nuclear power plants do not pollute the air". unlike fossil fuel-fired power plants, nuclear power plants do not produce chemicals or other components that could pollute the air. nuclear reactors work with uranium, creating energy by splitting the atoms in a fission chain reaction, which not results in the formation of carbon dioxide or other greenhouse gases.

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