单选题：Given a tree of degree 5. Suppose that the numbers of nodes of d

Given a tree of degree 5. Suppose that the numbers of nodes of degrees 1, 2, 3, 4, 5 are 3, 1, 2, 4, 3, respectively.
Then the number of leaf nodes must be _. @[C](3)

A. 24
B. 29
C. 30
D. 23




A.24
B.29
C.30
D.23


答案：C