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)