The correct option is A Awadh
Mir Jaffer failed to fulfill the endless demands of the British. So they dethroned Mir Jaffer and brought in his nephew Mir Qasim to power. Mir Qasim was independent in his outlook. After verifying the misuse of Dastakaths, he made all trade in Bengal tax free. This made the British to face the competition from the Indian Merchants. So they dethroned Mir Qasim and brought back Mir Jaffer to the throne.