Read the sentence given below to find out if it contains any error. The error, if any, will be in one part of the sentence. If the sentence is error free, select No error or option 5. Ignore error of punctuation if any.

As the Arctic dramatically warmed, (A)/ it was difficult to parse out all the (B)/ ways the changing climate were (C)/ affecting creatures that lived on land. (D)/ No error (E)