........... killed the .........
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Curiosity, rat
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Ccuriousity, cat
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Curiosity, mouse
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Curiosity, cat
D
Correct answer
Explanation
The correct idiom is 'Curiosity killed the cat', meaning unnecessary investigation can lead to trouble. Option D has the correct spelling of both words: 'Curiosity' (not 'Ccuriousity' or similar) and 'cat' (the animal referenced in the proverb).