The correct answer is: A. Ajatshatru
Ajatshatru was the king of Magadha from 492 to 462 BCE. He was the son of Bimbisara and the grandson of Mahapadma Nanda. Ajatshatru is best known for his defeat of the Vajji confederacy and the founding of the city of Pataliputra.
The Vajji confederacy was a powerful alliance of tribes that lived in the Ganges Valley. Ajatshatru was determined to conquer the Vajjis, and he eventually succeeded in doing so in 461 BCE. After the defeat of the Vajjis, Ajatshatru founded the city of Pataliputra on the site of their capital city. Pataliputra became the capital of the Magadha Empire and one of the most important cities in India.
Ajatshatru was a powerful and successful king, but he was also a ruthless one. He is said to have killed his own father, Bimbisara, in order to seize the throne. Ajatshatru was also responsible for the death of his brother, Vasavamitra.
Despite his ruthlessness, Ajatshatru was a capable ruler. He expanded the Magadha Empire and made it one of the most powerful kingdoms in India. He also founded the city of Pataliputra, which became a major center of trade and culture.
Ajatshatru died in 462 BCE. He was succeeded by his son, Udayin.
Ajatshatru was a complex figure. He was a powerful and successful king, but he was also a ruthless one. He is best known for his defeat of the Vajji confederacy and the founding of the city of Pataliputra.