Correct option is D
Indica is the famous book written by Megasthenes, the Greek ambassador to the court of Chandragupta Maurya. Indica is one of the earliest accounts of India by a foreign writer, offering valuable insights into the Mauryan Empire, its governance, society, economy, and military. While the original text of Indica has been lost, fragments of it have been preserved through references in later works by Greek and Roman writers like Strabo, Arrian, and Diodorus. Megasthenes' observations on the caste system, agriculture, and the capital city of Pataliputra have greatly contributed to the understanding of ancient Indian history.
