Answer: a. Center of gravity of the displaced liquid
The centre of buoyancy is the centre of gravity of the displaced liquid.
Solution:
Due to the net vertical component of the hydrostatic pressure forces that the body experiences when it is either fully or partially submerged in a fluid, a lift is produced. The centre of buoyancy is the location where this vertical force acts, and it is the term used to describe both the lift and the phenomenon known as buoyancy. The centroid of the volume of fluid displaced or the centre of the body's submerged volume is where the centre of buoyancy is located. Hence the centre of buoyancy is the centre of gravity of the displaced liquid.
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