What is the author's intent when discussing Close's focus on the head of his subjects? A. The author compares the artistic impact of photographs of heads to that of abstract photographs of the same head. B. The author ruminates on what early experiences led to Close's focus on the head as a unifying theme in his work. C. The author expounds upon how, by not accepting commissions, Close's work has remained free of commercial influences. D. The author deconstructs the impact that Close's illness had on the content of his paintings. E. The author believes that Close's approach of depicting the head but none of the personality of the subject is rare.