Conclusion: when the economy improves, the average age of cars will return to former levels. means people will start replacing their old cars with new ones.
Reason: poor economy.
Which of the following, if true, most seriously calls into question the car manufacturers' prediction?
Pre-think: People will not replace their car if new technology has enhanced the average life of the car (It was my thinking).
(A) Fewer cars per year are now being manufactured in Morigia than were being manufactured there five years ago. fewer cars are now being manufactured, means price will be high and this may continue even after economy will show upward trend. High price low selling.
(B) When the threat of job loss is particularly strong, people are reluctant to commit themselves to expensive purchases. - don't know whether car is an expensive purchase or not.
(C) The older a car is, the greater the amount of upkeep it requires. don't know whether greater upkeep is better deal than buying new car or not.
(D) The air-pollution control devices now being used in cars manufactured in Morigia cost less than those that were used seven years ago. - Out of scope.
(E) Most people in Morigia now believe that replacing an old car with a new one has very undesirable ecological consequences. - clearly alternate reason. so, correct choice.