In which liquid is hydrogen bonding the most significant force of attraction

After a thorough research, there exists the same question that has the following choices:

1. HF(l) 
2. HCl(l) 
3. HBr(l) 
4. HI(l)

The correct answer is (1) HF(I). When hydrogen is attached to a more electronegative atom, then molecules get more polar. HF has the strongest  hydrogen bonding together with the electronegativity of the fluorine atom.