The table presents the data used to construct an oxygen dissociation curve for adult haemoglobin. What is the percentage increase in the volume of oxygen per gram of haemoglobin when the partial pressure of oxygen rises from $3\,\text{kPa}$ to $5\,\text{kPa}$?
- A32.8%
- B39.6%
- C60.4%
- D65.5%