The diagram depicts a sphere at rest which is just completely submerged in a liquid. The sphere has radius $r$ and the liquid has density $\rho$. The acceleration of free fall is $g$. The air applies pressure $P_A$ to the liquid surface. What is the pressure at the lowest point of the sphere?
- A$P_A + \frac{4}{3}\pi r^3 \rho g$
- B$P_A - \frac{4}{3}\pi r^3 \rho g$
- C$2r\rho g + P_A$
- D$2r\rho g - P_A$