In Assam, a source of hot water spring is situated in

Nambor Reserve Forest
Orang Wildlife Sanctuary
Manas National Park
Parashuram Kunda

The correct answer is D. Parashuram Kunda.

Parashuram Kunda is a hot water spring situated in the Sonitpur district of Assam, India. It is a popular tourist destination and is believed to have medicinal properties. The spring is said to have originated from the axe of Parashurama, an incarnation of Vishnu.

The other options are incorrect because:

  • Nambor Reserve Forest is a forest reserve in the Golaghat district of Assam.
  • Orang Wildlife Sanctuary is a wildlife sanctuary in the Sonitpur district of Assam.
  • Manas National Park is a national park in the Golaghat and Sonitpur districts of Assam.