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, 4, 2, 1, 3, respectively.
Then the number of leaf nodes must be_. @[D](3)

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




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


答案：D