It is given to find out which of the given statements is false about resonance. 

Explanation

Resonance reduces electron-electron repulsion by allowing the electron density to spread throughout the atoms or bonds. This decreases the hybrid's free energy and raises the stability of the molecule.

Because resonance makes the molecule more stable, it lessens reactivity. A molecule likes to react less the more stable it is. 

Hence the correct answer is C) It increases the reactivity of the molecule.