The population of Bihar in India is

maximum
second to the maximum
third to the maximum
forth to the maximum

The correct answer is: C. third to the maximum.

Bihar is the third most populous state in India, with a population of 103,804,637 as of 2011. Uttar Pradesh is the most populous state, with a population of 200,396,322, followed by Maharashtra with a population of 112,374,333.

Option A is incorrect because Uttar Pradesh has a larger population than Bihar.

Option B is incorrect because Maharashtra has a larger population than Bihar.

Option D is incorrect because West Bengal has a larger population than Bihar.