Suppose that five numbers are pushed onto a stack in the order {1, 2, 3, 4, 5}, and the pop sequence is {3, 5, 4, 2, 1}. To obtain such a result, the minimum size of the stack must be: @[C](2)

A. 2
B. 3
C. 4
D. 5



A.2
B.3
C.4
D.5


答案：C