Improve the bracketed part of the sentence. This is (a illegitimate) demand. 

Improve the bracketed part of the sentence. This is (a illegitimate) demand.  Correct Answer An illegitimate

The correct answer is option 1.

The phrase in the bracketed part must be replaced with 'an' since the subject starts with a vowel (i). 

Therefore, the correct answer is: This is an illegitimate demand.

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