They examined both the samples very carefully but failed ...
Which of the phrases given below the sentence should replace the phrase printed in bold type to make it grammatically correct? If the sentence is correct as it is, mark 'E' as the answer.
They examined both the samples very carefully but failed to detect any difference in them.
some difference in
some difference between
any difference between
any difference among
No correction required
Correct answer is C
No explanation has been provided for this answer.
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