Which of the following, if true about traveling fairs, most seriously weakens the argument?

　　 Before each relocation, the operators dismantle their rides, observing and repairing potential sources of danger, such as worn ball bearings.

　　 their managers have less capital to spend on the safety and upkeep of the rides than do managers of permanent fairs.

　　 Since they can travel to new customers, they rely less on keeping up a good reputation for safety.

　　 While they are traveling, the fairs do not receive notices of equipment recalls sent out by the manufacturers of their rides.

　　 The operators of the rides often do not pay careful attention to the instructions for operating their rides.

　　4. When cut, the synthetic material fiberglass, like asbestos, releases microscopic fibers into the air. It is known that people who inhale asbestos, fibers suffer impairment of lung functions. A study of 300 factory workers who regularly cut fiberglass showed that their lung capacity is, on average, only 90 percent of that of a comparable group of people who do not cut fiberglass.

　　The statements above, if true, most strongly support which of the following hypotheses?

　　 People who work with fiberglass are likely also to work with asbestos.

　　 Fiberglass fibers impair lung function in people who inhale them.

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