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. Rarely the authorities had encountered (a) such a coordinated attempt (b) to exploit regulatory loopholes (c) across multiple jurisdictions simultaneously (d). No error (e)