A teacher one day pointed out to his students the peculiar fact that water is a unique liquid which freezes exactly at 0$°$C and boils exactly at 100$°$C. He asked the students to find the correct statement based on this fact.

• A

  Water dissolves anything, however sparingly the dissolution may be.

• B

  Water is a polar molecule.

• C

  Boiling and freezing temperatures of water were used to define a temperature scale.

• D

  Liquid water is denser than ice.