When a liquid of density $\rho$ flows through a tube of diameter $d$ with critical velocity $V$,then the Reynolds number is (where $\eta$ is the coefficient of viscosity of the liquid).
- A$\frac{\eta \rho}{V d}$
- B$\frac{V d}{\rho \eta}$
- C$\frac{\rho V d}{\eta}$
- D$\frac{V \eta d}{\rho}$
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