Taxi driver: My passengers complained when, on a hot day, I turned off my cab' s air conditioner while driving up a steep hill. While the engine is powerful enough to both run the air conditioner and climb the hill without slowing, this would have decreased my fuel economy considerably. So turning off the air conditioner was the right decision. Which one of the following principles, if valid, most supports the taxi driver's reasoning? ['A taxi driver should always act in a way that is most likely to ensure customer satisfaction.', "A taxi driver should run a cab's air conditioner only if doing so does not cause fuel economy to drop below normal levels.", 'A taxi driver should try to balance concern for fuel economy with concern for passenger comfort.', "A taxi driver's turning off air-conditioning for a short period of time is acceptable only if passengers do not complain."]