A city council member argues, 'To reduce traffic congestion during peak hours, we must invest in expanding our subway system. A larger, more efficient subway will persuade thousands of commuters to abandon their cars for public transit.' Which of the following is a necessary assumption in the council member's argument?
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A
Building a new subway line is less expensive than constructing new highways.
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B
A significant number of commuters who currently drive would be willing and able to use the expanded subway system.
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C
The current subway system is overcrowded and poorly maintained.
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D
Traffic congestion is the single most pressing issue for the city's residents.