The $B{F}_{3}$ is a planarn molecule where as $N{F}_{3}$ is pyramidal because:

(A) $B-F$ bond is more polar than $N-F$ bond.

(B) Boron atom is bigger than nitrogen atom.

(C) Nitrogen is more electronegative than boron.

(D) $B{F}_{3}$ has no lone pair but $N{F}_{3}$ has a lone pair of electrons.