Which of the phrases given below the sentence should replace the word/phrase that is underlined in the sentence to make it grammatically correct? If the sentence is correct as it is given and no correction is required, mark 'No correction required' as the answer.
The trousers is too big for me to fit.
1
The trousers are
2
The pair of trousers is
3
The trouser are
4
Both 1 and 2
5
No correction required