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Choose the right sequential phenomena among the following during the delivery of \( \mathrm{O}_{2} \) from blood to tissue.
I. Absorption of \( \mathrm{CO}_{2} \) by the blood.
II. Reaction of absorbed \( \mathrm{CO}_{2} \) with \( \mathrm{H}_{2} \mathrm{O} \) to form \( \mathrm{H}_{2} \mathrm{CO}_{3} \) within \( \mathrm{RBC} \) and its conversion into \( \mathrm{H}^{+} \)and \( \mathrm{HCO}_{3}^{-} \)ions.

III. Reaction of absorbed \( \mathrm{CO}_{2} \) with \( \mathrm{H}_{2} \mathrm{O} \) in plasma to form \( \mathrm{H}_{2} \mathrm{CO}_{3} \) and its conversion into \( \mathrm{H}^{+} \)and \( \mathrm{HCO}_{3}^{-} \)ions.

IV. Combination of \( \mathrm{H}^{+} \)with haem portion of \( \mathrm{HbO}_{2} \) to release \( \mathrm{O}_{2} \).
V. Combination of \( \mathrm{HCO}_{3}^{-} \)with haem portion of \( \mathrm{HbO}_{2} \) to form reduced haemoglobin and release of \( \mathrm{O}_{2} \).
(a) I, II, V
(b) I, III, IV
(c) I, II, IV
(d) I, III, V
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