Which of the Following Is NOT a Reason for the Difficulty

Which of the following is NOT a reason for the difficulty in measuring marcom effectiveness? 

A)  lack of ability by marcom practitioners 
B)  obstacles in identifying an appropriate measure, or metric, of effectiveness 
C)  complications with getting people throughout the organization to agree that a particular measure is the most appropriate 
D)  snags with gathering accurate data to assess effectiveness 
E)  problems with determining the exact effect that specific marcom elements have on the measure that has been selected to indicate effectiveness