Figure 46-1 Refer to the Accompanying Figure

Figure 46-1 Refer to the accompanying figure. Place figures 1-4 in the correct order to represent the two-cycle breathing process of birds.

A) 1 → 2 → 3 → 4
B) 2 → 3 → 4 → 1
C) 2 → 3 → 1 → 4
D) 3 → 2 → 1 → 4
E) 4 → 3 → 2 → 1