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【单选题】
(2016· 全国 I , 13) 短周期元素 W 、 X 、 Y 、 Z 的原子序数依次增加。 m 、 p 、 r 是由这些元素组成的二元化合物, n 是元素 Z 的单质,通常为黄绿色气体, q 的水溶液具有漂白性, 0.01 mol·L -1 r 溶液的 pH 为 2 , s 通常是难溶于水的混合物。上述物质的转化关系如图所示。下列说法正确的是 ( ) 。
A.
．原子半径的大小 W
B.
．元素的非金属性 Z>X>Y
C.
． Y 的氢化物常温常压下为液态
D.
． X 的最高价氧化物的水化物为强酸
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