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). 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)

Q: Answer-Read each sentence carefully to find out whether there is any grammatical or idiomatic error in it....

This sentence contains a subjectverb agreement error. The subject of the clause is communities, which is plural. However, it is incorrectly followed by the singular verb is engaged. According to the rule of subjectverb agreement, a plural subject must take a plural verb. Therefore, the correct construction should be communities are engaged. The rest of the sentence is grammatically sound, making part c the erroneous segment.