A closed rectangular vessel completely fllled with a liquid of density $\mathrm{\rho }$ moves with an acceleration a = g. The value of the pressure difference at point A and B i.e., (${\mathrm{P}}_1-{\mathrm{P}}_2$) is:

• A

  $\mathrm{\rho g}(\mathrm{b}-\mathrm{h})$

• B

  $\frac{\mathrm{\rho gh}}{2}$

• C

  $\mathrm{\rho gh}$

• D

  $\frac{\mathrm{\rho g}(\mathrm{b}+\mathrm{h})}{2}$