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Having an efficient, attractive subway system makes good economic sense. So, the city needs to purchase new subway cars, since the city should always do what makes good economic sense. The conclusion drawn above follows logically if which one of the following is assumed?
Options:
A .  The city should invest in an efficient, attractive subway system
B .  Cost-effective subway cars are an integral part of an efficient subway system
C .  Investment in new subway cars makes better economic sense than many of the other investment options open to the city
D .  New subway cars are required in order for the city to have a subway system that is efficient and attractive
Answer: Option D
:
D
The assumption required in the above passage is that new subway cars are required to make the subway system efficient and attractive and hence make good economic sense. This is given only in option (d). If this assumption is not there then maybe even old cars are sufficient to have an efficient subway system. Hence this is the most important assumption

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