Contemporaries of Kanishka
 Kanishka, a prominent ruler of the Kushan Empire, is known for his patronage of Buddhism and scholars. During his reign, several notable scholars flourished.
 Ashvaghosh was a renowned Buddhist philosopher and poet, known for his works like Buddhacharita. He was a contemporary of Kanishka and played a significant role in the spread of Buddhism.
 Nagarjuna, a key figure in Mahayana Buddhism, was also active during Kanishka's time. He is credited with founding the Madhyamaka school of Buddhist philosophy.
 Vasumitra, another Buddhist scholar, was associated with the Fourth Buddhist Council convened by Kanishka.
 Conclusion
 Buddhaghosa, however, was not a contemporary of Kanishka. He lived much later, around the 5th century CE. Therefore, the correct answer is Option D: I, II, III.