Hoop stress and longitudinal stress in a boiler shell under internal pressure are \[100\,\text{MN/}{{\text{m}}^{\text{2}}}\] and \[50\,MN/{{m}^{2}}\] respectively. Young's modulus of elasticity and Poisson's ratio of the shell material are \[200\,\text{GN/}{{\text{m}}^{\text{2}}}\] and 0.3 respectively. The hoop strain in boiler shell is:

• A. \[0.425\times {{10}^{-\,3}}\]
• B. \[0.5\times {{10}^{-\,3}}\]
• C. \[0.585\times {{10}^{-\,3}}\]
• D. \[0.75\times {{10}^{-\,3}}\]