Nawab Siraj-ud-Daulah or Bengal was defeated by the English in the battle of Plassey, mainly

A because the English forces were much stronger than those of the Nawab
B because of Clive's conspiracy with the Nawab's Commander- in- Chief Mir Jafar and rich bankers of Bengal
C because of Siraj-ud-Daulah's retirement from the battlefield
D because of the capture of a band of Frenchmen under the Nawab's service by the English