The correct answer is A. 318.
The Bihar Legislative Assembly is the unicameral legislature of the Indian state of Bihar. It is composed of 318 members, elected from single-member constituencies by first-past-the-post voting. The term of the Assembly is five years.
The Assembly was first constituted in 1937, under the Government of India Act, 1935. The number of seats in the Assembly has been increased several times since then, most recently in 2008.
The current Speaker of the Assembly is Vijay Kumar Sinha. The Leader of the House is the Chief Minister of Bihar, Nitish Kumar. The Leader of the Opposition is Tejashwi Yadav.
The Assembly meets in the Vidhan Sabha Bhavan, Patna.
Option A: 318 is the correct answer.
Option B: 324 is incorrect. The number of seats in the Bihar Legislative Assembly was increased from 324 to 318 in 2008.
Option C: 331 is incorrect. The number of seats in the Bihar Legislative Assembly has never been 331.
Option D: 313 is incorrect. The number of seats in the Bihar Legislative Assembly has never been 313.