The correct answer is B. 20.3 km.
The density of rail route in Bihar per 1,000 sq. km is 20.3 km. This means that there are 20.3 km of railway track for every 1,000 sq. km of land in Bihar. This is higher than the national average of 12 km per 1,000 sq. km.
The high density of rail routes in Bihar is due to the state’s strategic location. Bihar is located in the heart of India, and it is a major transportation hub. The state is also home to a number of important industrial and commercial centers.
The high density of rail routes in Bihar has a number of benefits. It makes it easier for people and goods to move around the state. It also helps to boost the state’s economy. However, the high density of rail routes also has some drawbacks. It can lead to congestion and delays. It can also be expensive to maintain and upgrade the rail infrastructure.
Overall, the high density of rail routes in Bihar is a positive development. It has a number of benefits for the state’s economy and people. However, it is important to manage the rail infrastructure effectively to avoid congestion and delays.