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In a reinforced concrete section, the stress at the extreme fibre in compression is $5.80$ MPa. The depth of neutral axis in the section is $58$ mm and the grade of concrete is $M25$. Assuming linear elastic behavior of the concrete, the effective curvature of the section (in per mm) is

- $2.0 \times 10^{-6}$
- $3.0 \times 10^{-6}$
- $4.0 \times 10^{-6}$
- $5.0 \times 10^{-6}$