If speed of light in vacuum $\left(3 \times 10^8 \,m/s\right)$, acceleration due to gravity $\left(10 \,m/s^2\right)$ and mass of electron $\left(9.1 \times 10^{-31} \,kg\right)$ are taken as fundamental physical quantities, then the unit of time in this system is
- A$3 \times 10^3 \,s$
- B$5 \times 10^{-19} \,s$
- C$3 \times 10^{19} \,s$
- D$3 \times 10^7 \,s$
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