单项选择题

A.CH3COCH2CH3,CH3CHO,CF3CHO,CH3COCH=CH2
B. CH3CHO,CF3CHO,CH3COCH2CH3,CH3COCH=CH2
C. CF3CHO,CH3CHO,CH3COCH=CH2,CH3COCH2CH3
D. CF3CHO,CH3COCH=CH2,CH3CHO,CH3COCH2CH3