Read the sentence to find out whether there is any error in it or not. The error, if any, will be in one part of the sentence. The number of that part is the answer. If there is no error, the answer is (5). Ignore errors of punctuation, if any. 

We think that we are in control of our (A)/ decision making, but our decision making power (B)/ can be influenced and affected by many (C)/ unknown and unseen factor. (D)