Explanation:

- Option 1: 1917

- The year 1917 is far too late for the event in question. By then, the British were well-established in India, and the Mughal Empire had considerably weakened.

- Option 2: 1765

- Yes, this is the correct option. In 1765, Shah Alam II granted the Diwani rights of Bengal, Bihar, and Orissa to the British East India Company following the Treaty of Allahabad. This marked a significant transfer of power and revenue control from the Mughals to the British.

- Option 3: 1835

- This year is too late for the appointment of the British East India Company as Diwan. By 1835, the British had expanded their control across much of India.

- Option 4: 1623

- This date is much too early. In 1623, the Mughal Empire was at the height of its power, and the British influence in India was minimal.