Refer to the figure:- $$P_{A} - P_{B}$$ is

A

$$h\left(\frac{\rho_{m}}{\rho_{1}}\right) \delta$$

B

$$h\left(\rho_m - \rho_1 \right) \delta$$

C

$$h(\rho_m \rho_1) \delta$$

D

$$h(\rho_m + \rho_1) \delta$$