Liquid Water When Boiled at 100^°C Gets Converted to Water

Liquid water when boiled at 100^°C gets converted to water vapor.Which of the following statements is correct for this phase transition?

A) The covalent bonds between hydrogen and oxygen atoms are broken.
B) The intermolecular hydrogen bonds between water molecules are broken.
C) The covalent bonds between hydrogen and oxygen atoms become weaker.
D) The bond distance between hydrogen and oxygen atoms increases.