A Thin-Walled Spherical Tank with a Diameter of 1 $\text { MPa. }$

A thin-walled spherical tank with a diameter of 1.5 m and wall thickness of 65 mm has an internal pres- sure of 20 MPa. The maximum shear stress in the wall of the tank is approximately: $\text { MPa. }$

A) $58 \mathrm { MPa }$
B) $67 \mathrm { MPa }$
C) $115 \mathrm { MPa }$
D) $127 \mathrm { MPa }$