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The Drombeg stone circle is a collection of megaliths (large prehistoric stones) located in Glandore, Ireland, that was used between 1100 BCE and 800 BCE.


The Drombeg stone circle measures approximately `31` ft across. Which of the following would be a reasonable approximation of its circumference?



A: 15.5
B: 49
C: 90
D: 97
E: 31π