Police chief: During my tenure as chief, crime in this city has fallen by 20 percent. This is clearly the result of my policing strategy, which uses real-time crime data and focuses police resources on the areas with the most crime. Which one of the following, if true, most calls into question the police chief's explanation for the drop in crime? ["The crime rate in the country as a whole fell by about 30 percent during the police chief's tenure.", "The crime rate in the police chief's city is higher now than it was several decades before the chief's tenure began.", "The crime rate in the police chief's city is still significantly higher than in many other cities.", "The crime rate in the police chief's city fell significantly during the first few years of the chief's tenure, then it leveled off."]