Put the following steps of stomach acid production in the correct order starting with the reaction that requires an enzyme.
1. h2co3 dissociates.
2. chloride ion combines with h+ in the gastric lumen.
3. water and co2 combine to form carbonic acid.
4. h+ and bicarbonate ion are transported into the gastric lumen.
5. cl- diffuses into the gastric lumen.
a) 3, 1, 2, 5, 4
b) 1, 3, 5, 2, 4
c) 4, 5, 3, 1, 2
d) 4, 5, 1, 2, 3
e) 3, 1, 4, 5, 2