同时满足①M⊆{1,2,3,4,5}；②若a∈M，则6－a∈M的非空集合M有 (

同时满足①M⊆{1,2,3,4,5}；②若a∈M，则6－a∈M的非空集合M有 (　　)

A.16个 B.15个 C.7个 D.6个

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同时满足①M⊆{1,2,3,4,5}；②若a∈M，则6－a∈M的非空集合M有 (

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