Select the word segment that substitutes (replaces) the bracketed word segment correctly and completes the sentence meaningfully. Select the option 'no correction required' if the sentence is correct as given.
She opened her mouth to say something, (but as she does she realizes that she) couldn't find any words to express her surprise.
1
but when she does she realises that she
2
but when she didn't she realised that she
3
but when she did she realized that she
4
No correction required