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(C) According to Le Chatelier's principle,the reaction $HbO_2 + H_3O^{+} + CO_2 \rightleftharpoons (H^{+} - Hb - CO_2) + O_2 + H_2O$ shifts to the rig

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Both $(A)$ and $(B)$ take place

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(C) According to Le Chatelier's principle,the reaction $HbO_2 + H_3O^{+} + CO_2 \rightleftharpoons (H^{+} - Hb - CO_2) + O_2 + H_2O$ shifts to the right (favouring $O_2$ release) when the concentration of reactants ($H_3O^{+}$ and $CO_2$) increases.$1$. During physical exertion,cellular respiration increases,leading to higher production of $CO_2$.$2$. Intense physical activity also leads to anaerobic respiration in muscles,producing lactic acid,which increases the concentration of $H_3O^{+}$ ions in the blood.Since both $CO_2$ and $H_3O^{+}$ increase,both factors promote the release of $O_2$ from $HbO_2$.

The binding of oxygen by haemoglobin $(Hb)$ forming $(HbO_2)$ is partially regulated by the concentration of $H_3O^{+}$ and dissolved $CO_2$ in blood.
$HbO_2 + H_3O^{+} + CO_2 \rightleftharpoons (H^{+} - Hb - CO_2) + O_2 + H_2O$
Release of $O_2$ is favoured when there is:

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The binding of oxygen by haemoglobin $(Hb)$ forming $(HbO_2)$ is partially regulated by the concentration of $H_3O^{+}$ and dissolved $CO_2$ in blood.$HbO_2 + H_3O^{+} + CO_2 \rightleftharpoons (H^{+} - Hb - CO_2) + O_2 + H_2O$Release of $O_2$ is favoured when there is: