【正确答案】 B

【答案解析】From the figure, it appears that x and y are equal, or nearly so. However, the given information states that BC ＞ CD, but this is not clear from the diagram. Use TACTIC 3: when you draw the figure on your scrap paper, exaggerate it. Draw it with BC much greater than CD. Now it is clear that y is greater.
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