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【单选题】
假如你要证明四个命题,序号为1,2,3,4是等价的。下列哪个选项表示四个命题是等价的A.
1→2,3→1,3→2,4→2,3→4,4→3
B.
1→2,1→3,2→4,3→4,4→1
C.
1→2,2→1,3→4,4→3
D.
1→3,2→1,3→2,4→1,4→2,4→3
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