Which of the following rivers has second longest length in the Bihar state?

The correct answer is: B. Bagmati

The Bagmati River is a tributary of the Ganges River in India and Nepal. It is the second longest river in Bihar, after the Ganges. The Bagmati River originates in the Himalayas and flows through the Kathmandu Valley in Nepal before entering India. It then flows through the states of Bihar and Uttar Pradesh before joining the Ganges River near Patna. The Bagmati River is a major source of irrigation and drinking water for millions of people in India and Nepal. It is also a popular tourist destination.

The other options are incorrect because:

• The Ganges River is the longest river in Bihar.
• The Mahananda River is the third longest river in Bihar.
• The Burhi Gandak River is the fourth longest river in Bihar.