Which Represents the Correct Order of Evolution of Chordate Features $\rightarrow$

Which represents the correct order of evolution of chordate features?

A) amnion $\rightarrow$ limbs $\rightarrow$ lungs $\rightarrow$ jaws $\rightarrow$ vertebrae
B) limbs $\rightarrow$ lungs $\rightarrow$ jaws $\rightarrow$ vertebrae $\rightarrow$ amnion
C) lungs $\rightarrow$ jaws $\rightarrow$ vertebrae $\rightarrow$ amnion $\rightarrow$ limbs
D) vertebrae $\rightarrow$ jaws $\rightarrow$ lungs $\rightarrow$ limbs $\rightarrow$ amnion
E) vertebrae $\rightarrow$ amnion $\rightarrow$ limbs $\rightarrow$ lungs $\rightarrow$ jaws