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【单选题】
分子式为C 9 H 12 的物质含有一个苯环且苯环上只有一个取代基，下列说话正确的是（ ）A.
该有机物不能发生加成反应，但能发生取代反应
B.
该有机物不能是酸性高锰酸钾溶液退色，但能使溴水退色
C.
该有机物分子中所有原子可能在同一平面上
D.
该有机物属于苯的同系物，该类物质的通式为C n H 2n-6 （n≥6）
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