47. How is the passage structured? (A) The first and second paragraph each mentions a problem, and the third offers a solution. (B) The first paragraph talks about a trend, and the second and third paragraphs talk about its advantages and disadvantages. (C) The first paragraph talks about a phenomenon, and the second and third paragraphs explain why. (D) The first paragraph introduces a topic. The second paragraph provides details, and the third paragraph gives a conclusion.