The correct options are
A Battle of Plassey
B Battle of Buxar
D Development of Calcutta as a capital city
After the battle of Plassey in 1757 and the battle of Buxar in 1764, the city of Murshidabad lost its importance. The city was the capital of the Nawabs of Bengal. As the Nawabs lost the battle, the city too lost its importance. The British made Calcutta their administrative centre. With the expansion of British political power, the British centres of administration also gained importance.