${\mathrm{CO}}_2$ is dissolved in haemoglobin or blood plasma as

In the given graph curves $\mathrm{A}, \mathrm{B}$ and $\mathrm{C}$ represent the relation between partial pressure of oxygen $\left({\mathrm{pO}}_2\right)$ and saturation of haemoglobin with oxygen. If curve $\mathrm{A}$ represents the condition of blood in a regular artery then please select the correct statement from below.

Select the favourable conditions required for the formation of oxyhaemoglobin at the alveoli.

Study the following oxygen-haemoglobin dissociation curve which explains the effect of pH on the saturation of haemoglobin with oxygen. Find out an option that gives the correct descending order of pH for $\mathrm{x}, \mathrm{y}$ and $\mathrm{z}.$

Study the following forms of transport of respiratory gases
A) ${\mathrm{CO}}_2$ as bicarbonates
B) ${\mathrm{O}}_2$ through plasma
C) ${\mathrm{CO}}_2$ as carbamino compounds
D) ${\mathrm{O}}_2$ through $\mathrm{RBC}$
E) ${\mathrm{CO}}_2$ in a dissolved state
Arrange the above in sequence in ascending order based on their percentages.