Who was the founder of Karnata dynasty in Mithila?

Nanyadeva
Narsimhadeva
Vijaydeva
All of the above

The correct answer is A. Nanyadeva.

Nanyadeva was the founder of the Karnata dynasty in Mithila. He was a powerful ruler who expanded his kingdom to include much of present-day Bihar and Jharkhand. He was also a patron of the arts and literature.

B. Narsimhadeva was the son of Nanyadeva. He succeeded his father as king and ruled for a short period of time. He was a capable ruler, but he was not as successful as his father.

C. Vijaydeva was the grandson of Nanyadeva. He succeeded his father, Narsimhadeva, as king. He was a weak ruler and his kingdom was soon conquered by the Sena dynasty.

D. All of the above is not the correct answer because it includes options B and C, which are incorrect.