A Cylindrical Tank Is Assembled by Welding Steel Sections Circumfer- $45 \mathrm{MPa}$

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 in the cylindrical part of the tank
Is approximately: (A) $45 \mathrm{MPa}$
(B) $57 \mathrm{MPa}$
(C) $62 \mathrm{MPa}$
(D) $75 \mathrm{MPa}$