A fine$-$grained soil sample has $200$ gr of mass. After drying in the oven, the mass of this sample reduces by $40$ gr $.$ What will be the value of $tan()$ in the below figure? The below figure shows the Atterberg limit test for this sample. The water density is $1g\frac{r}{c}{m}^3.$

Hint $1$: It can be proved that $tan()$ is equal to the mass of solid over the water density. $($i$.$e$.tan()=($mass of solid$/$water density$).$

Hint $2$: Use the equation in hint $1$ and simply calculate the answer.

$V$ is the soil volume

a$.40c{m}^3$

b$.160c{m}^3$

c$.240c{m}^3$

d$.200c{m}^3$