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【单选题】
研究发现，烯烃在合适催化剂作用下可双键断裂，两端基团重新组合为新的烯烃，若CH 2 ==C(CH 3 )CH 2 CH 3 与CH 2 ==CHCH 2 CH 3 的混合物发生该类反应，则新生成的烯烃中一定共平面的碳原子数可能为(    )
A.
2，3，4
B.
3，4，5
C.
4，5，6
D.
5，6，7
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