单选题：The following list is a series of operations for a stack:

The following list is a series of operations for a stack:
* push 1
* push 2
* push 3
* pop
* pop
* push 4
* push 5
* pop
* push 6
* push 7
* pop
* pop
* pop
* push 8
* pop
* push 9
* pop
* pop

Which is the correct pop-up sequence？
@[C](3)

A. 1 2 3 4 5 6 7 8 9
B. 9 8 7 6 5 4 3 2 1
C. 3 2 5 7 6 4 8 9 1
D. 3 2 5 7 4 6 9 8 1



A.1 2 3 4 5 6 7 8 9
B.9 8 7 6 5 4 3 2 1
C.3 2 5 7 6 4 8 9 1
D.3 2 5 7 4 6 9 8 1


答案：C