GPT To determine which choice explains why the pressure at the bottom of aquarium A is greater than at the bottom of aquarium B, we need to consider the factors that affect pressure in a fluid. The pressure P at a given depth in a fluid is given by the equation: = P=gh where: is the density of the fluid, g is the acceleration due to gravity, h is the height or depth of the fluid column. Let's examine each answer choice: A is filled with fresh water, B has the same amount of salt water. - Salt water is denser than fresh water, so if both aquariums have the same height of water, the aquarium with salt water (B) would have a higher pressure at the bottom, not A. This choice suggests the opposite of what we need. A is filled to a greater depth than B. - This directly relates to the equation = P=gh. If aquarium A is filled to a greater depth than aquarium B, the value of h is greater for A, which would result in a greater pressure at the bottom of A. This choice aligns with the physics of how pressure in a fluid works. A has greater volume than B. - The volume of the aquarium does not directly affect the pressure at the bottom; it is the depth of the water column that matters, not the overall volume. The bottom of aquarium A has smaller area than that of B. - The area of the bottom of the aquarium does not affect the pressure; pressure is a scalar quantity and does not depend on the area over which it acts but rather on the depth and density of the fluid. Therefore, the most appropriate answer is: A is filled to a greater depth than B