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答案：
B
如果C再拥
12个tapes，她的数量就是R的两倍，（C+12=2R）问C拥有的数量是不是比R少？
（1）R拥有的多于5个。R>5 C+12>10 C>2 没有用 不充分
（2）C拥有的少于12个。 R=(C+12)/2 因为C小于12，所以R应该是在C和12之间（中数的关系），R>C，充分 
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