Which bond would be most polar why Solutionstarting with F t

Which bond would be most polar why

starting with F that is the most polar element, we should start analising this. N-F and C-F have the same polarity because the polarity of C and N is the same according with the periodic table. So analising F-B and getting that B have more polarity that C and N result that the bond with most polar in the answers is F-B. Remember how to find the polar according the table.