单选题：It is known that the fifth layer of a complete binary tree (the

It is known that the fifth layer of a complete binary tree (the root is the first layer) has 8 leaf nodes, then the number of nodes of the complete binary tree is at most ____.
@[C](3)

A. 31
B. 39
C. 47
D. 52



A.31
B.39
C.47
D.52


答案：C