The correct answer is: A. Parsva
Parsva was a Buddhist monk who lived in the 2nd century CE. He is said to have converted the Kushan emperor Kanishka to Buddhism. Parsva was a disciple of Vasumitra, and he is considered to be one of the founders of the Mahayana school of Buddhism.
Nagarjuna was a Buddhist philosopher who lived in the 2nd century CE. He is considered to be one of the most important figures in the development of Mahayana Buddhism. Nagarjuna is best known for his work on the Madhyamaka school of philosophy, which emphasizes the emptiness of all phenomena.
Asvaghosha was a Buddhist poet and philosopher who lived in the 2nd century CE. He is best known for his work on the Buddhacarita, an epic poem that tells the story of the Buddha’s life. Asvaghosha is also considered to be one of the founders of the Yogacara school of philosophy.
Vasumitra was a Buddhist monk who lived in the 2nd century CE. He is considered to be one of the founders of the Sarvastivada school of Buddhism. Vasumitra is best known for his work on the Abhidharmakosa, a massive encyclopedia of Buddhist doctrine.
It is important to note that there is no historical evidence to support the claim that Parsva converted Kanishka to Buddhism. The story of Parsva’s conversion of Kanishka is first found in the Mahavamsa, a Sri Lankan chronicle that was written in the 5th century CE. The Mahavamsa is not a reliable source of historical information, and it is likely that the story of Parsva’s conversion of Kanishka was invented by Buddhist monks in Sri Lanka in order to legitimize their own tradition.