A Cylindrical Tank Is Assembled by Welding Steel Sections Circumferentially $2.0 \mathrm { MPa }$

A cylindrical tank is assembled by welding steel sections circumferentially. Tank diameter is 1.5 m, thickness is 20 mm, and internal pressure is 2.0 MPa. The maximum shear stress in the cylindrical part of the $2.0 \mathrm { MPa }$ tank is approximately:

A) $17 \mathrm { MPa }$
B) $26 \mathrm { MPa }$
C) $34 \mathrm { MPa }$
D) $38 \mathrm { MPa }$