Answer: option C. HF
Explanation: A polar bond is a covalent bond between two atoms where the electrons forming the bond are unequally distributed. Fluorine is more electronegative than hydrogen so the electrons in the bond are more closely associated with the fluorine atom than with the hydrogen atom.
Maybe if you put it in english i’ll answer.. nahh jp i’m fluent
the answer is d. this is due to the fact a proton weighs 2000 times more then a electron