The correct answer is: B. Kharavela
Kharavela was a king of the Mahameghavahana dynasty of Kalinga, who ruled in the 2nd century BCE. He was a great patron of Jainism, and his reign saw the construction of many Jain temples and monasteries. He is also known for his inscriptions, which provide valuable information about the history of Kalinga and Jainism.
Kanishka was a Kushan emperor who ruled in the 1st and 2nd centuries CE. He was a patron of Buddhism, and his reign saw the spread of Buddhism to Central Asia and China.
Pushyamitra Sunga was a king of the Sunga dynasty who ruled in the 2nd century BCE. He was a patron of Hinduism, and his reign saw the construction of many Hindu temples and monasteries.
Samudragupta was a Gupta emperor who ruled in the 4th century CE. He was a patron of Hinduism, and his reign saw the spread of Hinduism to Southeast Asia.
Kharavela was the only ruler among the four options who was a patron of Jainism.