The correct answer is: Kanishka.
Kanishka was a Kushan emperor who ruled over a vast empire in Central Asia and the Indian subcontinent in the 1st and 2nd centuries CE. He was a great patron of Buddhism and is credited with holding the 4th Buddhist Council at Kundalvana in Kashmir. This council divided Buddhism into two sects: the Mahayana and the Hinayana.
Ashoka was a Mauryan emperor who ruled over most of the Indian subcontinent in the 3rd century BCE. He was a great patron of Buddhism and is credited with spreading the religion throughout his empire. However, there is no evidence that he held the 4th Buddhist Council.
Meghavhana was a Kadamba king who ruled over the Deccan region of India in the 4th century CE. He was a great patron of Buddhism and is credited with building many Buddhist temples and monasteries. However, there is no evidence that he held the 4th Buddhist Council.
Lalitaditya was a Karkota king who ruled over Kashmir in the 8th century CE. He was a great patron of Buddhism and is credited with building many Buddhist temples and monasteries. However, there is no evidence that he held the 4th Buddhist Council.
The 4th Buddhist Council was held at Kundalvana in Kashmir in the 1st century CE. It was attended by over 500 Buddhist monks and scholars. The council was convened by Kanishka, a Kushan emperor who was a great patron of Buddhism. The purpose of the council was to discuss and resolve various doctrinal and philosophical issues that had arisen in the Buddhist community. The council also decided to divide Buddhism into two sects: the Mahayana and the Hinayana.