I found your question in another source. See attached image. By definition we have: P = d x h x g where: P = Pressure (N / m²) d = Density (Kg / m³) h = Height (m) g = Force of gravity (m / s²) We have to: g = 9.8 (m / s²) d = 1000 Kg / m³ Therefore the pressure only depends on the height. We have then that the lowest pressure is at point A since that point represents the lowest height with respect to the surface: h = 20m Answer: A
