Who among the following rulers built five astronomical observatories at different places in north India?

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Step-by-step explanation:

1. Context: The question asks which ruler built five astronomical observatories in north India.
2. Historical fact: Maharaja Sawai Jai Singh II (also spelled Sawai Jaisingh II) of Jaipur commissioned and built five large observatories called Jantar Mantar during the early 18th century.
3. Locations: The five notable observatories attributed to him are at Jaipur, Delhi, Ujjain, Varanasi (Banaras) and Mathura.
4. Conclusion: Among the given options, Sawai Jaisingh II is the correct ruler.

FINAL_ANSWER: c

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