单选题：Given a tree of degree 3. Suppose that there are 4 nodes of degr

Given a tree of degree 3. Suppose that there are 4 nodes of degree 2 and 3 nodes of degree 3. Then the number of leaf nodes must be \_\_\_\_.

@[C](3)

A. 9
B. 10
C. 11
D. 12



A.9
B.10
C.11
D.12


答案：C