Answer and explanation

Correct answer: A. the fewer

  1. Step 1: 'The + comparative' pairs; 'mistakes' is countable so 'fewer'.
Answer
the fewer.
Why not the others: "less" is wrong because 'less' is used with uncountable nouns and 'the' is missing. "the less" is wrong because 'less' is used with uncountable nouns, and 'mistakes' is countable. "fewer" is wrong because the second part of the correlative needs 'the'.

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