The mayor boasts that the average ambulance turnaround time, the time from summons to delivery of the patient, has been reduced this year for top-priority emergencies. This is a serious misrepresentation. This "reduction" was produced simply by redefining "top priority. " Such emergencies used to include gunshot wounds and electrocutions, the most time-consuming cases. Now they are limited strictly to heart attacks and strokes. Which one of the following would strengthen the author's conclusion that it was the redefinition of "top priority" that produced the reduction in turnaround time? ['Other cities include gunshot wound cases in their category of top-priority emergencies.', "The mayor redefined the city's financial priorities this year.", "One half of all of last year's top-priority emergencies were gunshot wounds and electrocution cases.", 'Experts disagree with the mayor\'s definition of "top-priority emergency. "']