Against whom was the Battle of Plassey (1751) fought by the English Company led by Robert Clive?

Correct option is B

The Battle of Plassey in 1757 was fought by the English East India Company led by Robert Clive against Siraj Ud Daulah, the last independent Nawab of Bengal.
The battle took place at Palashi (Plassey) on the banks of the Hooghly River, about 150 kilometers (93 mi) north of Calcutta (now Kolkata) and south of Murshidabad in West Bengal, then the capital of Bengal Subah.
The Battle of Plassey was a decisive victory of the British East India Company over the Nawab of Bengal and his French allies on 23 June 1757, under the leadership of Robert Clive.