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