Answer: Option D. -> Dev Prayag
Answer: (d)
It is at Dev Prayag in Tehri Garhwal district of Uttarakhand that Alaknanda and Bhagirathi rivers meet and take the name Ganga or Ganges River. It is one of the Panch Prayag (five confluences) of the Alaknanda River.
The Alaknanda rises at the feet of the Satopanth and Bhagirath Kharak glaciers in Uttarakhand. The headwaters of the Bhagirathi are formed at Gaumukh, at the foot of the Gangotri glacier and Khatling glaciers in the Garhwal Himalaya.

Answer: Option B. -> Luni - Rajasthan
Answer: (b)

Answer: Option A. -> Cauvery
Answer: (a)

Answer: Option A. -> Narmada
Answer: (a)

Answer: Option B. -> Tapti
Answer: (b)

Answer: Option C. -> Brahmaputra
Answer: (c)

Answer: Option C. -> Neither 1 nor 2
Answer: (c)

Answer: Option A. -> Narmada
Answer: (a)The Narmada, also called the Rewa, is a river in central India and the fifth longest river in the Indian subcontinent. It is the third longest river that flows entirely within India, after the Godavari and the Krishna.

Answer: Option C. -> 3 only
Answer: (c)
The Manas River is a major tributary of the Brahmaputra River and flowing through Assam. It is named after "Goddess Manasa", the serpent God in Hindu mythology.
The Manas River is a transboundary river in the Himalayan foothills between southern Bhutan and India.

Answer: Option C. -> 1, 2 and 3
Answer: (c)