Direction: Read the given sentence to find out whether there is any grammatical/contextual error in it. The error, if any, will be in one part of the sentence. If no part in the sentence has an error then, mark 'No Error' as your answer. Consider the part in bold as grammatically correct. (Ignore punctuation errors, if any).

Neither of the man seemed to pay the slightest attention (A)/ to either sculpture or the painters, (B)/ but one of them seemed to be/ keeping an eye on the door while (C)/ the other spoke in low tones to his companion. (D)/ No error (E)