$A$ charged particle having a drift velocity of $7.5 \times 10^{-4} \, m s^{-1}$ in an electric field of $3 \times 10^{-10} \, V m^{-1}$ has a mobility in $m^{2} V^{-1} s^{-1}$ of:
- A$2.25 \times 10^{-15}$
- B$2.25 \times 10^{15}$
- C$2.5 \times 10^{6}$
- D$2.5 \times 10^{-6}$
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