A. Two orioles sing in the green willows, and a row of egrets ascends to the blue sky. The birds make sounds by vibrating their song membranes. Doesn't fit the purpose of the question.
B. Li Bai was about to travel in a boat when he suddenly heard people singing on the shore. People sing by vibrating their vocal cords. Doesn't fit the purpose of the question.
C. The apes on both sides of the strait can't stop crying. The boat has passed the Ten Thousand Mountains. The sounds made by the apes are caused by the vibration of their vocal cords, which does not fit the meaning of the question.
D. The sound of wind and rain at night, and how many flowers fall, are made by air vibration, which is in line with the meaning of the question.
So choose D.