The human body is estimated to contain a total of $2.5 \times 10^{13}$ red blood cells. Each day, about $2.5 \times 10^{11}$ red blood cells are taken out of the circulation and substituted by stem cells in the bone marrow. What percentage of the overall number of red blood cells is replaced per day?
- A0.01%
- B0.1%
- C1%
- D10%