Which of the Following Describes the CORRECT Path of Air

Which of the following describes the CORRECT path of air through a bird's respiratory system?

A) trachea, posterior air sacs, lungs, anterior air sacs, trachea
B) trachea, anterior air sacs, lungs, posterior air sacs, trachea
C) trachea, lungs, anterior air sacs, posterior air sacs, trachea
D) trachea, lungs, posterior air sacs, anterior air sacs, trachea
E) trachea, anterior air sacs, posterior air sacs, lungs, trachea