单选题：If the node `p` is an immediate predecessor of the node `q` in t

If the node p is an immediate predecessor of the node q in the inorder traversal sequence of the binary tree T, then which of the following relationship between p and q is *impossible* ?

I. q is the parent of p

II. q is the right child of p

III. q is the right sibling of p

IV. q is the grandparent of p



A.I only
B.III only
C.II and III only
D.II and IV only


答案：B