Read each sentence to find out whether there is any grammatical error in it. The error, if any, will be in one part of the sentence. Choose the option corresponding to that part. If the sentence is correct, mark "No error".  (a) Not only the aggressive marketing campaign failed  (b) to resonate with the target demographic,  (c) but it also permanently alienated the company’s  (d) fiercely loyal existing customer base.  (e) No error.