A boiler shell 200 cm diameter and plate thickness 1.5 cm is subjected to internal pressure of 1.5 MN/m , then the hoop stress will be_________________?
A. 30 MN/m2
B. 50 MN/m2
C. 100 MN/m2
D. 200 MN/m2
E. 300 MN/m2