Explanation
The incorrect pairing is D: Thangka Painting: Assam.
Thangka painting is a traditional form of Tibetan Buddhist painting that is commonly associated with the Himalayan regions of Tibet, Nepal, Bhutan, and some parts of northern India, such as Ladakh and Sikkim. While it is true that there are many Tibetan Buddhist monasteries in Assam and some thangka paintings may be found there, thangka painting is not a traditional art form of Assam.
On the other hand, Manjusha painting is a traditional folk art form that originated in the state of Bihar. Paitkar painting is a traditional art form from Jharkhand, which involves painting on a specially prepared canvas made of tussar silk. Patua art is a traditional form of scroll painting from the state of West Bengal, which depicts stories from mythology and social issues.