I was wondering which of the following sentences is correct: (1) Due to her success in bringing the matter to the city council, the measure was passed. (2) Due to her success of bringing the matter to the city council, the measure was passed. Any help you can give me would be very appreciated. Thank you very much.

Both “in” and “of” are prepositions, but I would use “in” in the way you’ve written the sentence.

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