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Option 3 : Before

The correct option is 3 as preposition ‘before’ should be used as ‘had been’  gives a clue that he was living in Jaipur before he moved to Kolkata.

'When' and 'since' do not fulfil the requirement.

When is used to ask ‘ at what time’ and since is used to indicate ‘something that started in past is still going on until now’.

Therefore, the correct sentence is:

Kartik had been living in Jaipur before he moved to Kolkata.

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