$\text {What four equations provide for the four unknowns \(u , v , w , p\) that are most often of interest in}$

$\text {What four equations provide for the four unknowns \(u , v , w , p\) that are most often of interest in}$ $\text {fluid mechanics?}$

A) Continuity, momentum
B) Continuity, momentum, energy
C) Continuity, momentum, energy, equation of state
D) Continuity, momentum, energy, enthalpy relation