Consider the following reaction : $Phenol \xrightarrow{Zn\; dust} X \xrightarrow[Anhydrous \;AlCl_3]{CH_3Cl} Y \xrightarrow{Alkaline \; KMnO_4} Z,$ the product of Z is :

Question

( A ) Benzene
( B ) Toluene
( C ) Benzaldehyde
( D ) Benzoic acid