(1) The aircraft carrier was originally floating on the water, and the buoyancy was equal to gravity; After the plane flies away from the aircraft carrier, the total weight of the aircraft carrier decreases, but it still floats, so the buoyancy decreases accordingly;

(2) As the buoyancy of the aircraft carrier decreases, when the density of water remains unchanged, it can be known from the formula V row =F floating ρ liquid G that the boiling water volume of the aircraft carrier decreases, that is, it will float a little.

So choose B.