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) During the televised press conference, the newly appointed  (b) municipal commissioner strongly emphasized on the urgent  (c) need to systematically overhaul the city's crumbling infrastructure  (d) before the imminent onset of the monsoon season.  (e) No error.