Alright, let’s picture this — hydrogen bonding is like those strong “secret handshakes” between molecules, but they only happen when hydrogen is hanging out with really electronegative atoms like oxygen, nitrogen, or fluorine.  

So, imagine each option: in water (H₂O), glycerol, and HF, hydrogen has those electronegative buddies. But in one of them, hydrogen’s partner isn’t very electronegative, so the handshake is weak or doesn’t happen at all.  

Which one do you think has the “shy” partner that doesn’t grab hydrogen’s hand firmly?