The volume of a liquid is proportional to......,given its density $\rho$,viscosity $\eta$ and $t$ the time of flow through a capillary tube of length $L$ and radius $R$,with a pressure difference $p$ across its ends.

• A
  $\frac{p^2 R^2 t}{\eta L}$
• B
  $\frac{p R^4}{\eta L t}$
• C
  $\frac{p R^4 t}{\eta L}$
• D
  $\frac{p^2 R^2 t}{\eta L^2}$