Option c is the correct answer. Kautilya, also known as Chanakya, was the prime minister of Chandragupta Maurya. He played a crucial role in assisting Chandragupta Maurya in his rise to power and was instrumental in the establishment of the Maurya Empire. Chanakya's teachings and guidance as a strategist, philosopher, economist, and royal advisor were influential in shaping the early Mauryan state. Important Tips Chandragupta II: Ruled Gupta Empire, 380-412 CE, known as Vikramaditya. Carried forward father's expansionist strategy, expanding empire through military conquest. Conquered Western Kshatrapas, enlarging Gupta domain: from Indus River to Bengal, Himalayan foothills to Narmada River. Daughter Prabhavatigupta possibly held sway over Vakataka kingdom during her regency. Gupta Empire flourished, evidenced by Chinese pilgrim Faxian's account of peaceful, prosperous rule. Vikramaditya legend linked to Chandragupta II; Sanskrit poet Kalidasa likely served as his court poet. Janaka King: Ruled Videha in Mithila, 8th or 7th century BC. Videha rulers called Janakas; Janaka in Ramayana, Sita's father. Exemplified non-attachment, spiritual inclination, engaged with sages. His bond with adopted daughter Sita led to her being Janaki. Janakpur in Nepal named after him; ruled Videha between Gandaki and Mahananda Rivers, north of Ganga, south of Himalayas.