In Your Own Body,which Pathway Is an Example of the Longest

In your own body,which pathway is an example of the longest path an O₂ molecule must take to arrive at its destination?

A) From the nose to the lungs
B) From the alveoli to the capillaries in the lungs
C) From the capillary blood of the lungs to an erythrocyte
D) From the lungs to a calf muscle
E) From the tissue capillaries to a muscle cell