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medium · GMAT Verbal Reasoning

An argument proposes: 'The city should replace its traditional bus fleet with electric buses to reduce overall air pollution.'

Which of the following is an assumption required by this argument?

  1. The city already has enough charging stations to support a full electric fleet.
  2. All city residents currently rely on the traditional bus fleet for their daily commuting.
  3. Electric buses are more expensive to maintain than traditional buses.
  4. Electric buses produce no emissions whatsoever at any point in their life cycle.
  5. Traditional buses are currently a meaningful contributor to the city's air pollution.

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