Explanation:

- In 1765, the Mughal Emperor Shah Alam II officially appointed the East India Company as the Diwan of Bengal. This meant that the Company was granted the right to collect revenue on behalf of the emperor, marking a significant moment in British expansion in India.

- Option:1, 1758 - This year does not correspond to the appointment of the East India Company as the Diwan of Bengal. It’s not related to this specific event.

- Option:2, 1755 - Similarly, this year has no direct relevance to the appointment. It occurred before the significant battles that led to British ascendancy in Bengal.

- Option:3, 1760 - While occurring around the same timeline, this year is not when the appointment as Diwan happened but rather a period of strengthening British control post-Battle of Plassey.