单选题：Given a tree of degree 6. Suppose that the numbers of nodes of d

Given a tree of degree 6. Suppose that the numbers of nodes of degrees 1, 2, 3, 4, 5, 6 are 3, 5, 1, 2, 4, 3, respectively. Then the number of leaf nodes must be: @[D](3)

A. 35
B. 39
C. 43
D. 45




A.35
B.39
C.43
D.45


答案：D