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Option 1 : was purely an increase
The correct answer is option 1) i.e. was purely an increase
- The underlined part is incorrect because 'pure' is an adjective and hence cannot modify the verb 'increase'.
- To modify the verb 'increase' we need an adverb, and 'purely' is an adverb form of 'pure'.
- Option 3 cannot be used as a replacement, as 'were' will create a subject-verb disagreement in the sentence.
- Option 1 rectifies the error of the given phrase and makes the sentence grammatically and contextually correct.
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