41. Which of the following is the most appropriate topic sentence for the paragraph below?
(A) Confronting too many unpleasant truths can be unmanageable.
(B) Rationalization is one of the most common defense mechanisms.
(C) Defense mechanisms are always undesirable.
(D) It is difficult to realize defense mechanisms in ourselves. _______________ Even the ancient Greeks understood defense mechanisms. In the Greek fable of the fox and the grapes, a fox who cannot reach the topmost grapes on a vine tells himself that they were probably sour anyway. The fox was using rationalization to protect his self-image. Likewise, people often think up a logical but untrue explanation that protects the unrealistic picture we hold of ourselves.