A tensile load of 60kN is gradually applied to a circular bar of 4cm diameter and 5cm long. What will be the stress in the rod if E=1×10⁵ N/mm²?

• A. 47.746 N/mm²
• B. 34.15 N/mm²
• C. 48.456 N/mm²
• D. 71.02 N/mm²