The correct option is A Pataliputra
Mauryan Empire was a state with capital at Pataliputra near the junction of the Son and Ganga rivers which lasted from about 321 to 185 BCE. Chandragupta Maurya was the founder of the dynasty. He established the empire by defeating the Nanda Dynasty and rapidly expanded his power westwards across central and western India. He was aided and counselled by his chief minister Kautilya also known as Chanakya.