A taxi driver earns a flat amount per passenger plus a charge per mile driven. Based on current gas prices, she estimates that approximately 35 percent of the money she earns per mile driven will be spent on gasoline. However, for the past two weeks, the taxi driver has in fact spent about 45 percent of the money she earns per mile on gasoline. Yesterday, while performing routine maintenance on her car, she noticed that her tires were somewhat underinflated, which would negatively affect her car’s gas mileage.
Of the following claims, which is most strongly supported by the passage?
A. The taxi driver’s gas mileage has steadily gotten worse over the past two weeks.
B. Even before discovering the issue with her tires, the taxi driver had reason to believe that on at least some nights her car’s gas mileage was worse than anticipated.
C. When her car is in perfect maintenance, the taxi driver spends 35 percent of the money she earns per mile on gasoline.
D. The taxi driver’s gas mileage fluctuated greatly over the past two weeks.
E. The increased proportion of earnings spent on gasoline decreased the taxi driver’s overall income.