In the past year, residents in Delhi have been suffering from a mysterious illness. A report said that over the past five years, Delhi's air has become extremely polluted, and contains a lot of toxins. Medical experts hypothesized that it is these pollutants that are causing the illness.

Which of the following options puts the hypothesis in doubt?

1
Some of the people who have been newly diagnosed began to develop the disease before the air in Delhi got polluted.
2
Those affected have been residing in Delhi for the past five years.
3
Both option 1 and option 2.
4
Neither option 1 nor option 2.

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