Question:medium

Given below sentence. A part of each 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

Updated On: Jun 30, 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 A

Solution and Explanation

The correct answer is option (A):
which one is the least costly

The correct answer is "which one is the least costly" because it maintains grammatical correctness and logical sense in the context of comparing two items. Let's break down why:

The original sentence "Of these two books which is the least costly" has a slight grammatical issue. While the overall meaning is understandable, it can be improved for clarity and natural flow.

The options provided attempt to correct this.

* "which one is the least costly": This is the correct choice. It clarifies that we are asking about a single book among the two ("which one"). The superlative adjective "least" correctly indicates a comparison of three or more items, as the original sentence has two books.
* "which is least costly one": This is grammatically incorrect. The word order is awkward, and the sentence feels unnatural.
* "which is less costly": This uses the comparative adjective "less," implying only two options. The use of "least" is correct here.
* "which one less cost": This is grammatically incorrect. "Less" should be an adjective, and "cost" should be changed to a descriptive term like "costly."

Therefore, "which one is the least costly" is the most appropriate and grammatically sound option, making it the best replacement for the underlined portion of the original sentence.
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