单项选择题

A.正构烯烃>异构烯烃>正构烷烃>异构烷烃
B.异构烯烃>正构烯烃>异构烷烃>正构烷烃
C.异构烯烃>异构烷烃>正构烯烃>正构烷烃
D.正构烯烃>正构烷烃>异构烯烃>异构烷烃