... is set in Ceylon, which is what the country was called in 1863 when Bizet wrote the oera. Either the question should have specified that only the name of the modern country was acceptable, or "Ceylon" should have been accepted.
"Ceylon" is the name given to the island by the British, who governed it from 1802 until 1948. The name Sri Lanka was officially adopted in 1972.
The opera is actually set "in ancient times".
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