Question
Read each sentence carefully to find out whether there
is any grammatical or idiomatic error in it. The error, if any, will be in one part of the sentence marked (a), (b), (c) or (d).If the sentence is correct as it is, choose “No error ” as option (e) your answer. Ignore errors of punctuation, if any. The effectiveness of public institutions depends not merely on policy formulation (a) but also on how efficiently such policies are executed (b) and whether accountability mechanisms exists (c) to monitor outcomes objectively (d). No error (e)Solution
This is a subject–verb agreement error. The subject mechanisms is plural, but the verb exists is singular. Correct form: mechanisms exist. All other parts are structurally and grammatically sound. Hence, the error is in part (c)
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