The correct answer is: Ganges River.
The Makar Sankranti Mela is a Hindu festival that is celebrated on the day of Makar Sankranti, which is the first day of the month of Magha in the Hindu calendar. The festival is celebrated in many parts of India, but it is especially popular in the state of Bihar.
One of the main attractions of the Makar Sankranti Mela in Bihar is the holy dip in the Ganges River. The Ganges River is considered to be a sacred river by Hindus, and many people believe that taking a dip in the river on the day of Makar Sankranti will cleanse them of their sins and bring them good luck.
The Makar Sankranti Mela is also a time for people to come together and celebrate the harvest. The festival is marked by fairs, food stalls, and cultural performances. It is a time for people to enjoy themselves and to connect with their culture.
The other options are:
- Son River: The Son River is a river in India that flows through the states of Madhya Pradesh, Chhattisgarh, Jharkhand, and Bihar. It is the longest tributary of the Ganges River.
- Kosi River: The Kosi River is a river in India that flows through the states of Bihar, Nepal, and Uttar Pradesh. It is the largest tributary of the Ganges River.
- Gandak River: The Gandak River is a river in India that flows through the states of Uttar Pradesh, Bihar, and Jharkhand. It is a tributary of the Ganges River.