It begins with the air crash, and then it goes back to what had happened before. After this the author resumes the narration of the air crash and subsequent event.
B.
It begins with what had happened before, and then it goes on with the air crash. After this the author resumes the narration of the air crash and subsequent event.
C.
It begins with the narration of the air crash and subsequent event, and then it goes on with the air crash. After this the author talks about the air crash.
D.
The account of the latest event is interrupted by a number of flashbacks (some earlier events and experiences).