How Does the Combined Volume of the Billions and Billions

Multiple Choice

How does the combined volume of the billions and billions of hexagonal open spaces in the structures of ice crystals in a piece of ice compare to the portion of ice that floats above the water line?

A) They are the same.
B) The volume of the open spaces is greater than the volume that extends above water.
C) The volume of the open space is less than the volume that extends above water.
D) The volumes are not related to each other.