Each of the following sentences has been divided into five parts (a), (b), (c), (d), and (e). One of these parts may contain a grammatical or idiomatic error. Identify the part that contains the error. If there is no error, choose option (e). The manager was appreciated (a) not for his technical skills alone (b) but for the manner in which he dealt (c) with unforeseen situations calmly and decisively (d). No error (e)