A Cylindrical Tank Is Assembled by Welding Steel Sections Circum- $17 \mathrm{MPa}$

A cylindrical tank is assembled by welding steel sections circum- ferentially. Tank diameter is 1.5 m, thickness is 20 mm, and internal pres-
Sure is 2.0 MPa. The maximum shear stress in the cylindrical part of the
Tank is approximately: (A) $17 \mathrm{MPa}$
(B) $26 \mathrm{MPa}$
(C) $34 \mathrm{MPa}$
(D) $38 \mathrm{MPa}$