The correct answer is B. center of pressure.
The center of pressure is the point at which the total force of the fluid acting on a submerged object can be considered to act. It is located below the center of gravity of the object, and its position depends on the shape of the object and the angle at which it is submerged.
The center of gravity is the point at which the entire weight of an object can be considered to act. It is located at the average position of all the mass of the object.
The metacenter is a point located on the vertical axis of an object that is floating in a fluid. It is the point at which the buoyant force acts. The metacenter is important because it determines whether an object will be stable or unstable when it is floating.
The center of buoyancy is the point at which the buoyant force acts on an object that is submerged in a fluid. It is located at the average position of all the displaced fluid.
In conclusion, the center of pressure is the point at which the total force of the fluid acting on a submerged object can be considered to act. It is located below the center of gravity of the object, and its position depends on the shape of the object and the angle at which it is submerged.