Question:

A part of the sentence is underlined which may contain an error. Replace the underlined part with the right choice.

Of these two books which is the least costly.

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Two items call for the comparative degree; the superlative needs three or more.
Updated On: Jul 21, 2026
  • which one is the least costly
  • which is least costly one
  • which is less costly
  • which one less cost
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The Correct Option is C

Solution and Explanation

When only two things are compared, English uses the comparative degree, not the superlative. With two books you say less costly, not the least costly, because least is used for three or more items.

  • which is less costly is correct because comparing exactly two books needs the comparative less costly.
  • which one is the least costly is wrong because it keeps the superlative least, which suits three or more items.
  • which is least costly one is wrong for the same superlative error and it is also awkwardly worded.
  • which one less cost is wrong because less cost is not a grammatical phrase and the verb is is missing.

For two books the comparative fits, so the answer is which is less costly.

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