Consumer advocates argue that the coating found on non-stick cookware contains harmful chemicals that are released into the air when the cookware is heated above a certain temperature. The manufacturer of the cookware acknowledges this hazard but assures consumers that the temperature threshold is much higher than would ever be needed for food preparation and therefore no special precautions need be taken in using the cookware. Which of the following, if true, would cast the most serious doubt on the claims of the manufacturer?
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AThe chemicals released by the coating can linger in the air for days
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BEmpty cookware left on the flame often reaches exceptionally high temperatures
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CSeveral consumers have already claimed illness as a result of using the cookware
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DThe manufacturer did not test the cookware for this phenomenon until consumer advocates brought the issue to its attention
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EThere are effective non-stick coatings that do not release toxins when heated
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正确答案: B