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 5, 3, 2, 3, 2, 1, respectively. Then the number of leaf nodes must be: @[C](3)

A. 26
B. 28
C. 30
D. 32




A.26
B.28
C.30
D.32


答案：C