If \(\vec{f}\) is the body force of an infinitesimally small element (volume dx dy dz and density ρ) moving along with the flow (velocity \(\vec{V}\)), Which term is the work done by the body force?

• A. \(\vec{f}.\vec{V}\)dx dy dz
• B. \(\rho\vec{f}.\vec{V}\)
• C. \(\rho\vec{f}.\vec{V}\)dx dy dz
• D. \(\rho\vec{f}\)dx dy dz