If the concentration of $Ca(HC{O}_3{)}_2$ is $85\mathrm{.}05m\frac{g}{L},$ what is the concentration in $m\frac{g}{L}$ as $CaC{O}_3$

A$.,52m\frac{g}{L}$ as $CaC{O}_3$

B$.,105m\frac{g}{L}$ as $CaC{O}_3$

C$.,31m\frac{g}{L}$ as $CaC{O}_3$

D$.,75m\frac{g}{L}$ as $CaC{O}_3$