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 usage error. Identify the part that contains the error. If the sentence is correct, choose Option (e) – No error. Several historians have argued (a) / that the decline of the empire cannot simply be attributed (b) / with economic stagnation (c) / but must also consider political fragmentation and military overextension (d). / No error (e)