Fill in the blank with the most appropriate word. A man's best friend is his _______.
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Correct option is
Option C is the correct answer because the correct idiom is 'a man's best friend is his dog'. It refers to animals that are of use to human beings, mostly used to address dogs. The loyalty and valuable services that dogs provide to human beings make them worthy of being called man’s best friend.
Options A, B, D and E are incorrect because none of these would complete the idiom correctly.