Explanation:

- The All India Muslim League was indeed formed in 1906. This event marked a significant step in the political journey of British India's Muslim community, emphasizing their unique cultural and political identity.

- Option 1: 1906 - The correct option, as the league was officially established on December 30, 1906, in Dhaka, which is now in Bangladesh.

- Option 2: 1910 - Incorrect. By 1910, the Muslim League was already active in political discussions and activities.

- Option 3: 1905 - Incorrect. This year was more notable for the Bengal Partition, another significant event in Indian history.

- Option 4: 1908 - Incorrect. The league was two years old by this time, continuing its role in advocating for Muslim political interests.