Using just a periodic table (not a table of electronegativities), decide which of these is likely to be the most polar bond. Explain your answer.
(a) $\mathrm{C}-\mathrm{F}$
(b) $\mathrm{S}-\mathrm{F}$
(c) $\mathrm{Si}-\mathrm{F}$
(d) $\mathrm{O}-\mathrm{F}$