Who is the man over there? Is it Mr. Wu?

— It ________ him, but I am not quite sure.

A．may be

B．maybe

C．is

D．must be

(1)百年老树枝繁叶茂(2)勘察施工线路(3)将老树平行移动300米 (4)研究制定移动方案(5)老树萌发新芽

A．(5)—(2)—(3)—(4)—(1)
B．(1)—(2)—(4)—(3)—(5)
C．(1)—(2)—(3)—(4)—(5)
D．(2)—(1)—(4)—(3)—(5)