A
Maharaja Sawai Jai Singh II of Jaipur
B
Emperor Shah Jahan
C
Raja Man Singh I
D
Sawai Ram Singh II
Correct answer: (a) Maharaja Sawai Jai Singh II of Jaipur
Explanation
Maharaja Sawai Jai Singh II of Jaipur constructed the Jantar Mantar astronomical observatories in the early 18th century, making option A correct and eliminating the other options.
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