Option B, They cannot be separated by using physical properties
I'll go over why the other three options are wrong.
Option A - Boiling water would break the Intermolecular Forces between molecules (Essentially, the force that keeps water molecules stuck together will break, not the force that holds the atoms together)
Option C- Water isn't a mixture (Assuming that it's distilled), and so filtering it would do absolutely nothing.
Option D - There aren't any metallic bonds in water, only polar covalent bonds.
Thus, the only answer left is Option B.
Let me know if you need me to explain anything I mentioned here.
-T.B.
