The correct option is B Shuja-ud-Daulah, Mughal Emperor Shah Alam II, Mir Qasim
The battle of Buxar was fought between the forces of the British East India Company and the combined army of an alliance of Shuja-ud-Daulah, Mughal Emperor Shah Alam II and Mir Qasim in the year 1764. The British victory at Buxar resulted in the end of the attempt to rule Bengal through a puppet nawab. The war came to an end by the "Treaty of Allahabad" in 1765.