Which relation is the basis of Mollier Diagram?

• A. \({C_p} = {\left( {\frac{{\partial h}}{{\partial T}}} \right)_P}\)
• B. \({C_v} = {\left( {\frac{{\partial Q}}{{\partial T}}} \right)_v}\)
• C. Cp - Cv = R
• D. \(T = {\left( {\frac{{\partial h}}{{\partial S}}} \right)_P}\)