A piece of ice floats in a vessel with water above which a layer of lighter oil is poured. When the whole of ice melts,which one of the following statements will be true?

• A

  The level of the interface will remain the same.

• B

  The total level of the liquids in the vessel will rise.

• C

  The total level of the liquids in the vessel will fall while the level of interface will go up. 

• D

  The level of interface as well as the total level of liquids in the vessel will fall.