Hydrostatic pressure depends on fluid density and depth Steps:

• Hydrostatic pressure is given by P = ρ g h, where ρ is fluid density, g is gravity, and h is depth below surface.
• Ocean water has higher density (ρ_ocean > ρ_lake), so for the same depth, pressure is greater in the ocean.
• Compare positions: assume A and B are in ocean (deeper for B), C is shallow in lake, D is deeper in lake.
• Smallest P occurs where ρ h product is minimized, which is shallowest depth in lowest-density fluid.

Why C is correct:

• C is at shallow depth in freshwater lake, minimizing both ρ and h per P = ρ g h formula.

Why the others are wrong:

• A: Ocean position has higher ρ than lake, increasing P.
• B: Deeper ocean position combines high ρ with larger h, maximizing P.
• D: Deeper lake position increases h, outweighing lower ρ compared to C.

Final answer: C