Total pressure combines atmospheric and hydrostatic components

Steps:

• Calculate hydrostatic pressure: ρgh = 1000 kg/m³ × 10 m/s² × 15 m = 150000 Pa.
• Add atmospheric pressure: 100000 Pa + 150000 Pa = 250000 Pa.

Why D is correct:

• Total pressure on the fish is P = P_atm + ρgh, accounting for both air pressure at the surface and the weight of the water column.

Why the others are wrong:

• A: Underestimates by ignoring full hydrostatic pressure (ρgh = 150000 Pa).
• B: Adds incorrect partial hydrostatic value to atmospheric pressure.
• C: Includes only hydrostatic pressure, omitting atmospheric pressure.

Final answer: D