The correct order of dipole moment of HF, HCl, HBr, Hl and $H_2$ Is :

$\mathrm{HF}>\mathrm{HCl}>\mathrm{HBr}>\mathrm{HI}>{\mathrm{H}}_2$ The electronegativity of the atoms in a chemical bond affects the dipole moment, which is a gauge of bond polarity. The dipole moment will be higher when the electronegativity of the atom is greater.

hence option is correct (c)