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 committee was unanimous (a) in their decision (b) that the policy needed to be revised (c) in order to address the emerging challenges (d). No error (e)