Correct Answer:
Option A - Jantar Mantar is an astronomical observatory situated in the heart of the capital city of India. It was constructed in 1724. Maharaja Jai Singh of Jaipur (Rajasthan) who built this observatory went on to build other observatories in Ujjain, Varanasi, Jaipur and Mathura.
A. Jantar Mantar is an astronomical observatory situated in the heart of the capital city of India. It was constructed in 1724. Maharaja Jai Singh of Jaipur (Rajasthan) who built this observatory went on to build other observatories in Ujjain, Varanasi, Jaipur and Mathura.