Which one among the following was the immediate cause of attack by Nawab Siraj–ud–daullah on Calcutta in 1756?

• A. Refusal of the English Company to pay the overdue trade tax
• B. The English conspired against the Nawab with a view to deposing him from the Throne
• C. Siraj–ud–daullah wanted to drive out the English from Bengal
• D. Refusal of the English to demolish the fortification of Calcutta