The correct answer is b) Ganga (Ganges).
The Ganga is the most important river in India and is also one of the longest rivers in the world. It flows through the states of Uttarakhand, Uttar Pradesh, Bihar, Jharkhand, West Bengal, and Sikkim. The Ganga is a sacred river for Hindus and is considered to be a source of life and purity. It is also an important source of water for irrigation and drinking water.
The Brahmaputra is the second longest river in India and is also one of the longest rivers in the world. It flows through the states of Arunachal Pradesh, Assam, and West Bengal. The Brahmaputra is a major source of water for irrigation and drinking water.
The Yamuna is a tributary of the Ganga and is the longest tributary of the Ganga. It flows through the states of Uttarakhand, Uttar Pradesh, Haryana, and Delhi. The Yamuna is a major source of water for irrigation and drinking water.
The Kosi is a river in India that flows through the states of Bihar and Nepal. It is one of the most important rivers in Bihar and is a major source of water for irrigation and drinking water. However, the Kosi is also a major source of flooding and has caused significant damage to the region in the past.