The correct option is A Mauryan
The Maurya Empire was a geographically extensive Iron Age historical power based in Magadha and founded by Chandragupta Maurya which dominated the Indian subcontinent between 322 and 185 BCE. Ring wells, which were first constructed under the Mauryas in the Gangetic plains spread beyond the heart of the empire. As ring wells supplied water to people for domestic use, it was no longer imperative to found settlements on the banks of rivers. Ring wells also served as soak pits in congested settlements. Hence, Option A is correct. Among the rest, the Kushan Empire was a syncretic empire, formed by the Yuezhi, in the Bactrian territories in the early 1st century.The Gupta Empire was an ancient Indian empire existing from the mid-to-late 3rd century CE to 543 CE. The Shunga Empire was an ancient Indian dynasty from Magadha that controlled areas of the central and eastern Indian subcontinent from around 187 to 78 BCE. Since Mauryan empire preceded all the other dynasties, rings wells came into prevalence for the first time in their reign and the rest are incorrect.