To determine whether the sentence is grammatically correct or if a replacement is needed, we will analyze each phrase option and its implications:
The original sentence reads: Most of the Indian workers are as healthy as, if not healthier than, British workers.
- The phrase in bold as healthy as, if not healthier than indicates a comparison between Indian workers and British workers, suggesting that Indian workers are at least as healthy as British workers and possibly healthier. This is a common structure in English to express comparative equality or superiority.
- Option A: as if healthy as not healthier - This phrase is ungrammatical and does not maintain the intended meaning of comparison.
- Option B: healthier but not as healthy - This option contradicts itself, as one cannot be healthier and not as healthy at the same time.
- Option C: as healthy, if not healthier - While similar, it lacks the comparative conjunction than required to properly complete the comparative expression.
- Option D: No correction required - The original phrasing is already correct, maintaining grammatically and contextually appropriate comparison.
Thus, the most suitable conclusion is Option D: No correction required.