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【单选题】
下面对投资组合分散化的说法哪些是正确的?( )
A.
适当的分散化可以减少或者消除系统风险
B.
当把越来越多的证券加入投资组合时，总体风险一般会以递减的速率下降
C.
分散化减少投资组合的期望收益，因为它减少了投资组合的总体风险
D.
除非投资组合包含至少30只个股，分散化降低风险的好处不会充分体现
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连带债权，不承担债务
B.
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【单选题】---Could you answer this questio,please? ---______.
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