From which of these terms does the turbulent viscosity arise from?

• A. ( frac{ partial( overline{ rho} tilde{u})}{ partial t} )
• B. (- frac{ partial tilde{p}}{ partial x} )
• C. (div( mu grad widetilde{( vec{V})}) )
• D. ( frac{ partial overline{( overline{ rho}u{ }v{ })}}{ partial y} )