Which of the following best describes the organization of the first two paragraphs of the passage? A. The author cites a basic principle of classical chemistry and then describes the research from which that principle was developed. B. The author cites an apparent contradiction to the principles of classical chemistry and then explains the process of a chemical reaction to show there is in fact no contradiction. C. the author describes the role of heat in chemical reactions and then offers a detailed explanation of its function. D. The author presents a law of classical chemistry in order to introduce a kind of chemical reaction that differs from it and then explains the essential difference between the two. E. The author presents the fundamental rules of classical chemistry in order to introduce an explanation of a specific chemical reaction.