The compression index is given by _________

• A. (C_c= frac{e_0-e}{log_{10} frac{ }{ _0}} )
• B. (C_c= frac{e}{log_{10} frac{ }{ _0}} )
• C. (C_c= frac{e_0-e}{ frac{ }{ _0}} )
• D. (C_c= frac{e_0}{log_{10} frac{ }{ _0}} )