Why nitration of benzene is easier than that of benzene And how is phenol converted to TNT

The nitration of phenol is easier than that of benzene because benzene has delocalised pie-electrons which makes it more stable than phenol.

Phenol is converted to Trinitrotoluene by adding zinc dust to remove the hydroxyl group, then reacted with Aluminium oxide followed by haloalkane.

the answer is option a.

the answer is c.the valence of the atoms combine .