Correct Answer:- D

After the defeat of Siraj ud- Daulah, his Commander in Chief Mir Jafar was installed as the Nawab of Bengal by the English Company. Mir Jafar promised huge money and territories to the English Company for being installed as the Nawab. When Mir Jafar failed to honour his promises, he was deposed and his son-in law Mir Qasim was installed as the Nawab of Bengal. Mir Qasim cleared all the dues to the Company, re-organized the army and administration of Bengal and began to assert his authority. He shifted his capital to Munger in Bihar, started an ordinance factory and attempted to model his troops on European lines. The Nawab also removed all the taxation on the internal trade in Bengal. This facility was earlier given only to the Company and therefore this policy hurt the profitability of the Company. When Mir-Qasim raised the issue of misuse of Dastaks by the private English
merchants known as ‘Interlopers’, the company was annoyed. Mir Qasim was defeated by the English in the battle of Giria near Vardhaman after which Mir Qasim escaped to Awadh and formed a common front against the English with the Nawab of Awadh Shuja-ud-daula and the later Mughal Emperor Shah Alam II who was living at Patna. This led to the Battle
of Buxar. The above actions of Mir Qasim made the Company wage a war against him and reinstate
Mir Jafar as the Nawab of Bengal in 1764.