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【单选题】
已知结论：“在正三角形 ABC 中，若 D 是边 BC 的中点， G 是三角形 ABC 的重心，则 ”。若把该结论推广到空间，则有结论：“在棱长都相等的四面体 ABCD 中，若 的中心为 M ，四面体内部一点 O 到四面体各面的距离都相等”，则 （ ）A.
1
B.
2
C.
3
D.
4
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【单选题】3
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C.
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D.
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