The correct answer to the question is option 4, Kanishka. The Fourth Buddhist Council was held in Kashmir and was led by Kanishka.

Option 1, Bindusara, is incorrect. Bindusara was the second Mauryan emperor, who came after Chandragupta Maurya and ruled from 298 BCE to 273 BCE. However, the Fourth Buddhist Council took place much later, during the time of Kanishka.

Option 2, Ashoka, is also incorrect. Ashoka was the third Mauryan emperor and ruled from 268 BCE to 232 BCE. While he played a significant role in the spread of Buddhism and held the Third Buddhist Council, he was not involved in the Fourth Buddhist Council.

Option 3, Kunal, is incorrect. There is no historical figure named Kunal associated with the Fourth Buddhist Council.

Therefore, the correct answer to the question is option 4, Kanishka, who was the leader of the Fourth Buddhist Council held in Kashmir.