Which of the phrases given in the options 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, select 'No correction required' as the answer.
BJP is the country's only political party with a trained political human resource, which will serve as the backing bone in the organization’s workforce in the coming years.
1
the backing bone of the organization’s
2
the backbone in the organization’s
3
the backbone of the organization’s
4
the backbones of the organization’s
5
No correction required