The correct order of the non-metallic character is

The correct answer is C
Over a period , as we proceed from left to right, the non-metallic character rises due to the shrinkage of the atom, which increases the tendency of the atom to take electrons from left to right. Increased size causes a decrease in the tendency to accept electrons from top to bottom, which results in a decrease in nonmetallic character even within a group.

Hence, the correct order will be $\mathrm{F}>\mathrm{N}>\mathrm{C}>\mathrm{B}>\mathrm{Si}$.