Option d is the correct answer. The Fourth Buddhist Council is believed to have taken place in the first century CE during the reign of the Kushan emperor Kanishka. Kanishka was a patron of Buddhism and played a significant role in its promotion and development. He convened the council in Kashmir to preserve and clarify the Buddhist scriptures and teachings. Important Tips The First Buddhist Council took place shortly after the passing of Gautama Buddha, around 483 BCE, in Rajgir, the capital of the Magadha kingdom The Second Buddhist Council was held approximately a century after the First Council, around 383 BCE, in Vaishali. The Third Buddhist Council took place in the 3rd century BCE, around 250 BCE, in Pataliputra (presentday Patna).