Compute the wall thickness in a $1\mathrm{.}2$ m $.$ diam. of steel pipe $6$ mm thick under a head of $120$ m $.$ of oil having a specific gravity of $0\mathrm{.}82.$

A$.83\mathrm{.}87$ kPa

C$.91\mathrm{.}24$ kPa

B$.96\mathrm{.}53$ kPa

D$.87\mathrm{.}81$ kPa