The correct answer is A. 2,06,484 km.
The Economic Survey 2018-19 states that the total length of road network in Bihar is 2,06,484 km. This includes national highways, state highways, major district roads, and rural roads. The state government has been making significant investments in road infrastructure in recent years, and the road network has been expanding rapidly. This has helped to improve connectivity and reduce travel times, and has also had a positive impact on the economy.
Option B is incorrect because it is the total length of road network in Uttar Pradesh. Option C is incorrect because it is the total length of road network in Madhya Pradesh. Option D is incorrect because it is the total length of road network in Maharashtra.