Explanation:

- Mehrunnisa, also known as Nur Jahan, married Emperor Jahangir in a significant event in Mughal history.

- Option 1: 1620 - This year is incorrect, as Mehrunnisa was already established as Nur Jahan by this time.

- Option 2: 1602 - This is incorrect. At this time, Mehrunnisa was still married to her first husband.

- Option 3: 1611 - This is the correct year when Mehrunnisa married Jahangir, after the death of her first husband, Sher Afghan.

- Option 4: 1603 - This is incorrect. Their meeting that led to marriage hadn't taken place yet.

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