Directions: In this question, a sentence has been divided into five parts (A), (B), (C), (D), and (E). Read the sentence to find out whether there is any grammatical error in it. The error if any, will be in one part of the sentence. If there is no error, the answer is 'No error'. Ignore the error of punctuation if any.

A pair of supportive (A)/ shoes are important (B)/ if you are (C)/ experiencing lower back pain. (D)/ No error (E)