The correct answer is: Pillars of Ashoka.
The Pillars of Ashoka are a series of edicts and inscriptions carved on stone pillars and rocks by the Mauryan emperor Ashoka the Great. The pillars are found throughout the Indian subcontinent, from Afghanistan in the northwest to Bangladesh in the east.
The pillars are an important source of information about the early history of India, including the Mauryan Empire. They provide information about Ashoka’s reign, his policies, and his religious beliefs. The pillars also contain information about the geography and history of the regions where they were found.
The Jatakas are a collection of Buddhist stories that tell the previous lives of the Buddha. The stories are set in various times and places, and they provide a glimpse into the social and cultural history of India.
The Puranas are a collection of Hindu texts that deal with a variety of topics, including mythology, history, and philosophy. The Puranas are an important source of information about the early history of India, but they are not as reliable as the Pillars of Ashoka.
The Arthashastra is a treatise on statecraft written by the ancient Indian philosopher Kautilya. The Arthashastra is an important source of information about the political and economic history of India, but it does not provide much information about the early history of Bihar.
In conclusion, the Pillars of Ashoka are the most important source of information about the early history of Bihar. The pillars provide information about the geography, history, and culture of the region, as well as the reign of Ashoka the Great.