按燃烧对象分类，火灾分为（）。

A、固体可燃物火灾

B、可燃液体火灾

C、可燃气体火灾

D、可燃金属火灾

E、带电火灾

I have advised him not to do like that, but he still insists on doing it that way. I think he has his own opinion          .

A．in all

B．above all

C．after all

D．first of all