A metal pipe of 1 m diameter contains a fluid having a pressure of \[10\,\,\text{kgf/c}{{\text{m}}^{\text{2}}}\text{.}\] If the permissible tensile stress in the metal is \[200\,\,\text{kgf/c}{{\text{m}}^{\text{2}}}\] then the thickness of the metal required for making the pipe would be:

• A. 5 mm
• B. 10 mm
• C. 20 mm
• D. 25 mm