The relative order of electronegativity of C , Ge , and Pb is

In the carbon family, the electronegativity decreases from carbon to silicon but remains constant from silicon to tin, then slightly increases for lead. And the elements of the carbon family are more electronegative than that of boron family due to the small atomic size.

So, correct order of electronegativity of given elements will be

$\mathrm{C} > \mathrm{Pb}>\mathrm{Ge}$