The answer to this question is that Ronald Reagan was the president who was known as the Great Communicator. So the answer is D.
Reagan had been a farily famous movie actor before he entered politics. Because of this, he had a great deal of experience and projecting various kinds of emotions to people via the media. He used this experience to be a very good politician. He was called the "Great Communicator" because he was said to have a knack for getting people to sympathize with his points of view. His movie acting experience came in handy in this regard because he knew how to proect the proper image to people as he spoke.