The correct option is B Fort William
The headquarters of East India Company were located at Fort William in Bengal. Fort William is a fort built in Calcutta (presently Kolkata) on the eastern banks of the River Hooghly, the major distributary of the River Ganges, during the early years of the Bengal Presidency of British India. It was named after King William III of England. In front of the Fort is the Maidan, which used to be a part of the Fort and is the largest urban park in Calcutta.