Read the sentence to find out whether there is any grammatical mistake/error in it. The error, if any, will be in one part of sentence. Mark that part with error as your answer. If the sentence is correct as it is, mark ‘No errors’ as your answer. (Ignore the errors of punctuation if any)
The foremost criterion of selection we adopted/were the number of years of training/a singer had received/under particular guru.
"Criterion" is singular => singular verb is required.
=> "was" is the correct verb.
"was the number of years of training" is correct.
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