Final answer:
Jassa Singh was chosen as the Supreme Commander of the Dal Khalsa on 29 March 1748. His leadership was crucial in defending the Sikh community against invasions. The correct option is a.
Step-by-step explanation:
The correct answer is a. 29 March 1748. Jassa Singh was chosen as the Supreme Commander of the Dal Khalsa on this date. Jassa Singh was a prominent Sikh leader who played a crucial role in the formation of the Sikh Empire in the 18th century.
During his leadership, Jassa Singh successfully organized and led the Sikh forces against the Mughal and Afghan invasions, protecting the Sikh community and their religious freedom.
His appointment as the Supreme Commander marks an important milestone in Sikh history and the establishment of the Dal Khalsa as a unified military force. The correct option is a.