The coefficient of compressibility aᵥ is given by _____________

• A. \(a_v=-\frac{e_0}{∆σ’}\)
• B. \(a_v=-\frac{∆σ’}{∆e}\)
• C. aᵥ=-∆e
• D. \(a_v=-\frac{∆e}{∆σ^{‘}}\)