The intrinsic carrier concentration of silicon sample at $$300^\circ K$$ is $$2.5 \times 10^{16} /m^3$$. If after doping, the number of majority carriers is $$5 \times 10^{20} /m^3$$ , the minority carrier density is:

A

$$1.25 \times 10^{12} /m^3$$

B

$$0.125 \times 10^{12} /m^3$$

C

$$2.5 \times 10^{20} /m^3$$

D

$$0.5 \times 10^{4} /m^3$$