Three Icebergs Are Each Floating in Bathtubs Filled to the Brim

Multiple Choice

Three icebergs are each floating in bathtubs filled to the brim with water. Iceberg A has large air bubbles in it. Iceberg B has unfrozen water in it. Iceberg C has an iron railroad spike in it. When the ice melts, what happens?

A) The water level in C will decrease while the other two water levels will remain the same.
B) The water level in A will stay the same, while the other tubs will spill over.
C) Only the water in C will spill over.
D) All the tubs spill over.
E) All stay exactly the same.