The variation of the boiling points of the hydrogen halides is in the order HF > HI > HBr > HCl. What explains the higher boiling point of hydrogen fluoride ?

Question

( A ) The effect of nuclear shielding is much reduced in fluorine which polarizes the HF molecule
( B ) The electro negativity of fluorine is much higher than for other elements in the group
( C ) The bond energy of HF molecules is greater than in other hydrogen halides
( D ) there is strong hydrogen bonding between HF molecules