The atoms under this question can be found elsewhere and as follows:
chlorine (Cl) - 3.61
sulfur (S) - 2.58
hydrogen (H) - 2.2
oxygen (O)- 3.44
fluorine (F)- 4
Based on difference in electronegativities between atoms, the most polar bond pair would be hydrogen and fluorine. They have the highest electronegativity difference.