The coefficient of volume change mv is given by ______

• A. \(m_v= \frac{1}{∆σ’} \)
• B. \(m_v= \frac{-∆e}{1+e_o} \)
• C. \(m_v= \frac{-∆e}{1+e_o} \frac{1}{∆σ}\)
• D. \(m_v= \frac{-∆e}{1+e_o} \frac{1}{∆σ’} \)