A Cylindrical Tank Is Assembled by Welding Steel Sections Circumfer- $22 \mathrm{MPa}$

A cylindrical tank is assembled by welding steel sections circumfer- entially. Tank diameter is 1.5 m, thickness is 20 mm, and internal pressure
Is 2.0 MPa. The maximum tensile stress perpendicular to the welds is
Approximately: (A) $22 \mathrm{MPa}$
(B) $29 \mathrm{MPa}$
(C) $33 \mathrm{MPa}$
(D) $37 \mathrm{MPa}$