the buoyant force must equal the weight of the ice. even if some of the ice cubes are completely submerged, you can add up the forces acting on each individual cube (ie, buoyant and weight). Or, alternatively, pretend that all the cubes are a funky-shaped single block of ice. it all leads to the same conclusion--the mass of water displaced = the mass of water in the ice. B is the answer, let's move on already.
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