was the advisor of Chandragupta Maurya.

The correct option is C Kautilya
The fate of Magadha changed during the Nanda rulers due to the thirst of revenge of a Brahmin named Vishnugupta who later became known as Kautilya or Chanakya. After a personal spat with the Nanda ruler Dhanananda, Kautilya vowed to dethrone him. Later, Kautilya paired with Chandragupta Maurya who aspired to establish his kingdom.