The Comfocar company manufactures a sedan that can drive comfortably at 80 miles per hour. A rival company, Turbocar, recently introduced a comparably equipped sedan that can drive comfortably at up to 110 miles per hour. Turbocar claims that its sedan will outsell Comfocar’s sedan because the Turbocar sedan can get customers to their destinations in comfort much faster than can the Comfocar sedan.
Which of the following, if true, casts the most doubt on Turbocar’s claims ？（）
A. Customers in surveys consistently rank comfort among the most important criteria in purchasing a car.
B. Many road surfaces are engineered to allow comfortable driving at speeds up to 120 miles per hour.
C. Automotive safety experts state that it is not safe for any car to be driven faster than 100 miles per hour.
D. Comprehensive research has determined that while the Turbocar model has faster acceleration and a higher top speed than the Comfocar sedan, both cars show approximately the same fuel efficiency.
E. Nowhere in the main marketing areas for these two car companies is it legal or practical to drive faster than 70 miles per hour.