Concept:A baoli is an ancient Indian water storage structure with steps to reach the water.Explanation:Baolis are traditional stepwells. They allow people to descend a set of steps to access water. These were common in drier parts of India. Separate baolis were built for drinking and bathing. Most were designed only for water storage. They were often constructed near mosques and temples. The architectural form has three parts: the well for water collection, flights of steps going down several levels, and intermediate pavilions. This is not a simple well, pond, or stream.Answer:Option B – Stepwell