单选题：Insert 7, 8, 9, 2, 3, 5, 6, 4 into an initially empty AVL tree.

Insert 7, 8, 9, 2, 3, 5, 6, 4 into an initially empty AVL tree. Which one of the following statements is FALSE? @[C](3)

A. the height of the AVL tree is 3
B. there are 2 nodes whose BF are -1
C. 8 is the root
D. 2 and 5 are siblings



A.the height of the AVL tree is 3
B.there are 2 nodes whose BF are -1
C.8 is the root
D.2 and 5 are siblings


答案：C