Answer: (Detailed Solution Below)
Option D: 1, 2, 3 and 4
Detailed Solution:
The correct answer is “1, 2, 3 and 4”.
Sawai Jai Singh II, Maharaja of Amber and Jaipur, constructed five observatories in the second quarter of the eighteenth century in the north Indian cities of Shahjahanabad (Delhi), Jaipur, Ujjain, Mathura, and Varanasi.