单选题：Given a tree of degree 3. Suppose that there are 3 nodes of degr

Given a tree of degree 3. Suppose that there are 3 nodes of degree 2 and 2 nodes of degree 3. Then the number of leaf nodes must be \_\_\_\_.


@[D](3)

A. 5
B. 6
C. 7
D. 8



A.5
B.6
C.7
D.8


答案：D