Compare the movement of oxygen and carbon dioxide across the cell membrane

"As oxygen-rich (and carbon dioxide-poor) blood travels by a cell the oxygen diffuses through the cell membrane to the area of lower concentration inside the cell. ... Because the CO2 is of a higher concentration in the cell than in the blood passing by, this gas continually diffuses out of the cell."

The answer is (c.) esophagus, stomach, small intestine.
The entire sequence of the movement of food during digestion is: mouth, esophagus, stomach, small intestine, large intestine. Don't be tricked with answer (b.) mouth, esophagus, small intestine. After esophagus food moves through the stomach.