The Comfocar company manufactures a sedan that can drive

Conclusion: Turbo sedan will outsell Comfo's because Turbo sedan can get customers to their destinations in comfort much faster than can the comfo sedan
Assumption:
(1) Given the same comfort, customers will like faster car.
(2) areas for these 2 car companies do not limit speed for sedan.

To weaken the conclusion, we just need to show the faster speed of Turbo does not gain any advantage in selling cars.

a)customers in surveys consistently rank comfort among the most important criteria in purchasing a car.
Wrong. Does not say anything about speed.

b)many road surfaces are engineered to allow comfortable drving at speeds up to 120 m/hr.
Wrong. Out of scope.

c)automotive safety experts state that it is not safe for any car to be driven faster than 100 m/hr.
Wrong. This is very classic logical flaw "Appeal to Authority". The stimulus does not mention anything as experts' comments will affect people's purchasing decision.For example, everybody knows driving fast is not safe but why people still want to drive fast? Because they want to save time, they want to enjoy fast speed....So Let assume Turbo's target customers are people who are busy and want to save time. They're willing to trade off between time saving and safety. Clearly, Turbo can outsell its sedan. Hence, C is wrong.

d)comprehensive research has determined that while the turbocar model has faster acceleration and a higher top speed than comfo sedan,both cars show approx the same fuel efficiency.
Wrong. Out of scope.

e)nowhere in the main mktng areas for these 2 car companies is it legal or practical to drive faster than 70 m/hr.
Correct. if areas for these 2 car companies limit speedequal or less than 70 m/hr, the 110m/hr advantage of Turbo does not make any point.

Hope it helps.