Which of these is the non-conservative differential form of Eulerian x-momentum equation?

• A. ( frac{ partial( rho u)}{ partial t}+ nabla.( rho u vec{V})=- frac{ partial p}{ partial x}+ rho f_x )
• B. ( rho frac{Du}{Dt}=- frac{ partial p}{ partial x}+ rho f_x )
• C. ( frac{( rho u)}{ partial t}=- frac{ partial p}{ partial x}+ rho f_x )
• D. ( rho frac{ partial u}{ partial t}=- frac{ partial p}{ partial x}+ rho f_x )