Option a is the correct answer. The first inscriptional evidence of the Sati pratha, the practice of a widow immolating herself on her husband's funeral pyre, has been found from Eran, a historical site in present-day Madhya Pradesh, India. The Eran inscription is a stone pillar inscription dated to 510 CE. It records the erection of a Garuda pillar by the Gupta king Bhanugupta in honor of Vishnu. It also mentions the invasion of the Hunas and the defeat of Toramana by Bhanugupta's general Goparaja. The inscription also contains a verse that praises the Sati of Goparaja's wife, who sacrificed herself on his funeral pyre.