Correct Answer: Water Conservation

Solution : The correct answer is Water Conservation.

Dholavira, part of India's archaeological heritage, boasts a pioneering stone-built water conservation system unparalleled in its era some 4,500 years ago. In July 2021, UNESCO designated it as India's 40th World Heritage Site. The advanced hydraulic engineering skills of the Harappan civilisation are evident in their intricate network of channels and stone reservoirs, showcasing their remarkable ability to conserve, harvest, and store water despite the limited technology of the third millennium BCE.