GMAT Sentence Correction (SC) | Re: A delegation of 60 farmers called on the chief minister so

Hi, I dont see usage of ITS anywhere. The only difference between option A and correct option D is called so as to plead and CALLED and pleaded. I think option A is better. They called to plead.

A delegation of 60 farmers called on the chief minister so as to plead for revival of the benefit scheme together with the revised compensation package offered by the government and the chief minister has very graciously concededtheir request