Critics of a new law that will allow extra-long passenger trains to travel on the state' s railroads are mistaken in claiming that these extra-long passenger trains are more dangerous than other types of passenger trains. In our neighboring state P, where extra-long passenger trains have been permitted, these extra-long passenger trains have resulted in fewer fatalities per mile than other types of passenger trains used in our state. Clearly, extra-long passenger trains are safer than other types of passenger trains. Which one of the following, if true, most seriously weakens the argument above? ['Fatalities involving all trains in state P are fewer due to lower speed limits and stricter training requirements for train conductors.', 'The new law would require the extra-long passenger trains to be equipped with special brakes that would allow them to stop more quickly than other trains.', 'Extra-long passenger trains reduce ticket prices by allowing the train to carry more passengers each trip.', "Critics of the new law are unaware that state P has allowed extra-long passenger trains to travel on state P's railroads."]