单选题：Given the structure of a binary search tree (as shown in the fig

Given the structure of a binary search tree (as shown in the figure), which one of the following insertion sequences is impossible? @[C](3)


A. `81 68 92 96 19 74`
B. `81 68 74 92 19 96`
C. `81 92 74 68 19 96`
D. `81 92 96 68 74 19`




A.`81 68 92 96 19 74`
B.`81 68 74 92 19 96`
C.`81 92 74 68 19 96`
D.`81 92 96 68 74 19`


答案：C