$A$ charged particle is moving in an electric field of $3 \times 10^{-10} \text{ Vm}^{-1}$ with mobility $2.5 \times 10^6 \text{ m}^2 \text{V}^{-1} \text{s}^{-1}$. Its drift velocity is:
- A$8.33 \times 10^{-4} \text{ m/s}$
- B$25 \times 10^4 \text{ m/s}$
- C$1.2 \times 10^{-4} \text{ m/s}$
- D$7.5 \times 10^{-4} \text{ m/s}$
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