Making a decision does not necessarily guarantee its implementation. The main reason for that is resistance. Resistance to implement a decision can stem from the fact that the implementer of the decision did not take or was not given any part in making the decision. The more change is involved with the decision, the more resistance will come out. This is a natural human reaction. Moreover, the decision-making process does not end with implementation, because there is the possibility of not realizing expected results. The correct answer is D.