When did Chandragupta Maurya build dams and irrigation systems?

The correct option is C 3rd century BCE
Lakes, dams and irrigation systems were extensively built during the time of Chandragupta Maurya around the 3rd century BCE. Similarly, in the first century BCE, the city of Sringaverapura near Allahabad had a sophisticated water harvesting system to channel the flood waters of river Ganga.