The pressure of a fluid Varies depth h as P=P0+ρgh, where p is the fluid density. This expression is associated with Pascal's law. Pressure in fluid varies with depth is hydro-static law which is derived from Pascal’s law. Pascal law states that in the same fluid ,at the same level, pressure is the same, at all points, but hydro-static law tells with increase in depth pressure increases and vice versa. In our question, pressure is given as a function of depth which is exactly associated with hydro-static law. But, since in option, it is not given so better to go with the Pascal’s law. Bernoulli's principle: This is an application of conservation of energy. Archimedes law: This law states that the buoyancy force exerted on the body by the liquid is equal to the weight of the fluid it displaces. Newton's law for fluids: A fluid whose stress at each point is linearly proportional to its strain rate at that point.