Read the sentence given below to find out if it contains any error. The error, if any, will be only in one part of the sentence. If the sentence is error-free, select No Error or Option 5(E). Ignore errors of punctuation, if any.

The little boy was (A)/ mesmerised by the snowfall (B)/ at the top of the mountain and (C)/ the surrounding of the place completely enchanted him. (D)/ No error. (E)