For a healthy human, the average number of haemoglobin molecules in a single red blood cell is 260 million. How many $\alpha$-globin chains are present in one red blood cell in a healthy human?
- A$1.3 \times 10^8$
- B$2.6 \times 10^8$
- C$5.2 \times 10^8$
- D$1.04 \times 10^9$