A thin spherical shell of diameter (d) and thickness (t) is subjected to an internal pressure (p). The stress in the shell material is
A
$$\frac{{{\text{pd}}}}{{\text{t}}}$$
B
$$\frac{{{\text{pd}}}}{{2{\text{t}}}}$$
C
$$\frac{{{\text{pd}}}}{{4{\text{t}}}}$$
D
$$\frac{{{\text{pd}}}}{{8{\text{t}}}}$$
Correct Answer: $$\frac{{{\text{pd}}}}{{4{\text{t}}}}$$