A Thin-Walled Cylindrical Tank with a Diameter of 200 Mm $11 \mathrm { MPa } .$

A thin-walled cylindrical tank with a diameter of 200 mm has an internal pressure of 11 MPa. The yield $11 \mathrm { MPa } .$ stress in tension is 250 MPa, the yield stress in shear is 140 MPa, and the factor of safety is 2. $250 \mathrm { MPa }$ $140 \mathrm { MPa }$ permissible thickness of the tank is approximately:

A) $8.2 \mathrm {~mm}$
B) $9.1 \mathrm {~mm}$
C) $9.8 \mathrm {~mm}$
D) $11.0 \mathrm {~mm}$