The correct answer is: a) Viswa Singha
Viswa Singha was the founder of the Koch dynasty in 1515. He was a powerful ruler who expanded the Koch kingdom to include much of present-day Assam and West Bengal. He was also a patron of the arts and literature.
Nara Narayan was the son of Viswa Singha. He succeeded his father as king in 1539. He was a wise and just ruler who further expanded the Koch kingdom. He also built many temples and other public works projects.
Chilarai was the grandson of Viswa Singha. He was a great military commander who led the Koch army to many victories. He was also a poet and musician.
Malladeva was the great-grandson of Viswa Singha. He was a weak and incompetent ruler who allowed the Koch kingdom to decline. He was eventually overthrown by his son, Nara Narayan.
Viswa Singha was the most important figure in the history of the Koch dynasty. He was a powerful and successful ruler who laid the foundation for the dynasty’s future greatness.