Compute the net head on a an impulse turbine from the following data: The pressure in the supply pipe at a point of $3$ ft above the level of the center of the jet is $320$ psi; the diameter of the supply pipe is $18$ in$.,$ and the water is supplied at the rate of $8\mathrm{.}5$ cfs$.$

A$.746$ ft

B$.738$ ft

C$.742$ ft

D$.735$ ft