Many students see the summer as a time to completely goof off and avoid any work or responsibilities. This attitude is a mistake. Students need to take advantage of their free time in the summer to learn about their own interests and develop their own talents. The "free time" of the summer should not be wasted. Which revision of the second sentence of this brief passage would improve its coherence and clarity? A) This is a mistake. B) No change is needed. C) This attitude is wrong. D) This attitude, however, is a mistake for a variety of reasons.