Before the Partition of Bengal in 1905, Bengal was the biggest province of British India. It consisted of parts of which of the following states?

Bihar and Orissa

The correct answer is Option 3- Bihar and Orissa

Before the Partition of Bengal in 1905, Bengal was indeed the largest province of British India. It consisted of parts of present-day Bangladesh, West Bengal, Bihar, and Odisha. The partition split Bengal into two entities, Eastern Bengal and Assam, with a Hindu-majority western part and a Muslim-majority eastern part, with the intent of creating religious division for administrative convenience, a move that faced significant opposition and contributed to the growth of Indian nationalism.