GMAT Critical Reasoning (CR) | Re: Consumer advocates argue that the coating found on non-stick

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