The correct option is C Si<B<C<N<F
The non-metallic character decreases down the group .
Hence, the increasing order of non-metallic character of C and Si is Si<C.
Non-metallic character increases in a period as we move from left to right.
So, the increasing order of non-metallic character B<C<N<F
Silicon is in 14th group and is also a metalloid so has less non metallic character than B
Overall order of non-metallic character is: Si<B<C<N<F