Direction: Spot the grammatical errors in the given sentence. Mark the part with error as your answer. If there is no error, mark "No error" as the answer. (Ignore punctuation error)

The results of the study showed that (a)/ if the partners were willing to talk to each other (b)/ and arrive at a mutually agreeable decision, (c)/ the joint decisions were more better than any one person's judgement. (d)/ No error (e)

[PNB(SO), 2010]