The human lungs can function satisfactorily up to a limit where the pressure difference between the outside and inside of the lungs is one$-$twentieth of an atmosphere. If a diver uses a snorkel for breathing, how far below the water can she swim? Assume the diver is in salt water whose density is $1025k\frac{g}{m^3}.$

A$.1\mathrm{.}7$ m

B$.0\mathrm{.}5$ m

C$.1\mathrm{.}0$ m

D$.2\mathrm{.}9$ m