The red portion is the answer but why is that the answer? Can someone please explain. Thank you.

Show the result of inserting the following values into an initially empty AVL tree 10, 7, 3, 22, 16, 13, 5, 18, 20 and 19. Draw a box around your result ater each insertion The resulting trees are as follows: Tree 1: Tree 2: Tree 3 Tree 4: Tree 5 Tree 6: 10 10 3 10 3 10 3 16 10 22 3 13 22 Tree 7: Tree 8: Tree 9: Tree 10: 10 5 16 3 7 13 22 10 5 16 3 7 13 22 10 5 16 3 713 20 10 5 18 3 7 16 20 20 4 5 3