The diagram represents a tank that is completely filled with water. The water in the tank has mass $m$. Its density is $\rho$. The depth of the water in the tank is $h$. Which equation shows the pressure $p$ caused by the water at the base of the tank?
- A$p = h\rho g$
- B$p = mgh$
- C$p = m\rho g$
- D$p = m\rho h$