The expansion curve is given by the expression ___________

• A. \(e_0=elog_{10} \frac{σ’_0+∆σ’}{σ’_0} \)
• B. \(e_0=e/C_s \frac{σ’_0+∆σ’}{σ’_0} \)
• C. \(e_0=e-C_s log_{10}\frac{σ’_0+∆σ’}{σ’_0} \)
• D. \(e_0=e+C_s log_{10} \frac{σ’}{σ’_0} \)