The liquid phase reaction $AB+C$ is to be carried out isothermally. Knowing that the entering molar flow rate of $A$ is $12mo\frac{l}{m}in,$ and entering volumetric flow rate is $10\frac{L}{m}in,$ and $($mol$/$L$.$min$)$

$],$ calculate the volume $($L$)$ of a CSTR reactor when A leaves at $20\%$ of its initial concentration.

a$.$ None

b$.2667$

c$.4800$

d$.1200$