In the below figure, what should be the $h$ value in meters to have bolling condition $($l$.$e$.$ quick condition$)$ at the bottom of the soll sample? The soll saturated unit weight $1520k\frac{N}{m^3}$ and the water unit weight is $10k\frac{N}{m^3}.$ The below figure is not to scale.

Hint $1$: For boiling to occur, the critical hydraulic gradient should be equal to:

Hint $2$: Rererring to the below rigure, the critical hydraulic gradient is equal to $0\mathrm{.}6).$ The value of $h$ is in meters.

Hint $3$: Use hints $1$ and $2$ and then calculate the value or $h.$

a$.0\mathrm{.}6$

D$.21$

c$.1\mathrm{.}2$

d$.0\mathrm{.}3$