The correct answer is C. Anga.
Manjusha Kala or Angika Art is a traditional art form of Bihar, India. It is a form of terracotta art that is practiced in the Anga region of Bihar. The art form is known for its intricate designs and patterns, which are often inspired by nature. Manjusha Kala is a popular tourist attraction in Bihar, and it is also used to decorate homes and temples.
The other options are incorrect because they are not regions of Bihar where Manjusha Kala is practiced. Vaishali is a district in Bihar, but Manjusha Kala is not practiced there. Magadh is a historical region in Bihar, but Manjusha Kala is not practiced there either. None of the above is also incorrect because Manjusha Kala is a real art form that is practiced in the Anga region of Bihar.