Correct Option: A

The first inscriptional evidence of satipratha has been found from Eran. Some reliable records indicate the practice before the time of the Gupta empire, approximately 400 CE. After about this time, instances of Sati began to be marked by inscribed memorial stones. According to Axel Michaels, the first clear proofs of the practice is from Nepal in 464 CE, and in India from 510 CE. In India, the earliest of these memorial stones are found in Sagar, Madhya Pradesh, though the largest collections date from several centuries later, and are found in Rajasthan.