Choose the correct one-word substitution for the given sentence.
That which cannot be corrected
Explanation: Incorrigible: (of a person or their behaviour) not able to be changed or reformed.
Indelible: (of ink or a pen) making marks that cannot be removed.
Illegible: not clear enough to be read.
Unintelligible: impossible to understand.
So, option (A) is correct.
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