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). Choose the option corresponding to that part. If the sentence is correct as it is, choose “No error (e)” as your answer. Ignore errors of punctuation, if any. The effectiveness of counter-terrorism measures (a) depends not merely on the deployment of force (b) but also on how sensitively the affected communities is engaged (c) during prolonged security operations (d). No error (e)